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Hacking the Fluorescent Light
DynaSoar writes "MSNBC reports on an elegant hack performed on the common fluorescent tube. By mixing phosphorescent material with the usual white fluorescent material, American Environmental Products has developed a tube that continues to glow when shut off. Originally intended for submarines, and then used in places where terrorists could disrupt services, they are also perfect for power outages, providing some light so you don't have to thrash around in the dark looking for your candles and flashlights. Since the 'hack' is inside the tube, they can also be removed from their fixtures and carried around, as well as provide light even if they're shattered."
OMG, all they need to do is put a hard-shield around the glass tube ;P
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Aren't fluorescent bulbs the ones that implode if mishandled? I just don't want a face full of glass when the power is out. If I am incorrect, then this hack is awesome.
how do you turn these lights off.
but how is this a hack? I mean its not something we could do ourselves at home and while its really nifty I don't see its overall usefulness to the everyday person for the cost. Wouldn't it just be cheaper to install glow in the dark plastic strips along the hallways and such? Just my $0.02.
"To face death, that's nothing much. But to feel really stupid when you die, well, that would be insufferable."
Why didn't i think of that?
"If any question why we died, Tell them because our fathers lied."
While this is a great product, I can see people like my granny going nuts over this. She can't handle the TV anymore (called me because it wouldn't work - I guess it has to be plugged in!), the telephone (has no idea how voicemail works, thinks that I am my answering machine). When lightbulbs exist that won't turn off, that might just be over the top.
Are you kidding? I think if they make it commercially available I'll replace every light in the house with these!
Glow in the dark lightbulbs is one of the best ideas I've ever heard. Think about when you're leaving a room and someone has left before you and turns out a light. No big deal you can still see. And how about everything that the blurb mentions? So quick to dismiss all of that?
These things even glow when broken, which is just mega cool. Innovation at its best.
"Victory means exit strategy, and it's important for the President to explain to us what the exit strategy is." G.W.Bush
I am installing these in my fleet of nuclear subs right away! :P
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"...used in places where terrorists could disrupt services,..."
Nothing like a little shilling for that fat government contract, yes?
...used in places where terrorists could disrupt services, they are also perfect for power outages...
Because we all know that terrorist attacks are way more common than power outages. I hate this "War on Terror." It's the major reason for doing anything at this point, and it's not a particularly good one.
Haida Manga
From TFA: "The tubes can even be removed from their fixture and carried around as portable light sources."
Now this is impressive. Unscrew the bulb/tube and walk with it to safety. Very nice idea.
"Even if the tubes are shattered by an explosion, the shards will still provide light"
A smart idea. Also can serve as a sort of "bread crumbs" way for people to explore in dark passageways and find their way back out. Kind of hard to clean up shattered glass tubing.
Up, Up, Down, Down, Left, Right, Left, Right, B, A, START
I always wanted a light bulb that I couldn't turn off. I suppose I could just remove the switch and connect the wires, but this solution is so much simpler.
Edward Burr
Having a smoking section in a restaurant is like having a peeing section in a swimming pool.
This is an excellent example of advancing something that we take for granted. Although the idea of carrying one of these is really bad considering the thin glass walls of the tube, as a safety device it makes sense for these to be fitted to shops, warehouses and offices.
Guys, I think the big reason this hasn't caught on already is that it would mean your lights could never be turned off instantly.
Your room would remain lit up for the few hours it takes for the glowing substance to completely discharge.
As neat as this feature is, I certainly wouldn't want it in my house.
What a bright idea!
I'll be here all night, ladies and gents!
If "disco" means "I learn" in Latin, does "discothèque" mean "I learn technology"?
Many fluorescent lamps already glow long enough in the dark to be annoying. And there are already emergency lights anywhere where terrorists (or natural disaster) can disrupt services, and presumably their batteries last longer, and they are controllable.
Well probably still a nice idea by itself, unlike using terrorist attack for the marketing.
The obvious problem I see is that if you switch them off, they keep on glowing. Clearly these are not useful except in a handful of very specific situations.
"Place me in the company of those who seek Truth, but deliver me from those who believe to have found it."
The terrorists could also use the same technology to continue their work after a [US] strike takes out power.
But the question is whether this is the same science in glow sticks or one Catholic rosary I have seen that glows in the dark.
The idea is clever, and real simple. All you do: 1) Purchase some glow-in-the-dark paint availiable at any common hobby store (not reflective paint, but glo-paint!) 2) Paint your "light stick..." he he ) (that's the neon tube to those of you that actually thought of something else). 3) Make sure you paint around the MIDDLE of the tube and not the contact-areas as the paint probably can catch fire if too close to the hot-coils inside the tube...that is...NOT near the terminals) 4) Now re-insert it into the socket armature. Have fun! It works the same way...it'll glow for hours. Now...you see...the man who invented this...probably did the same, but inside the tube instead....don't try THAT yourself..unless you have some smart way of filling the lamp with neon gas...again...and sealing tight! That's todays lesson for you - Have fun kids!
What this world is coming to - is for you and me to decide.
In several buildings where I have worked, there are a few lights in each (large) room near the exits that cannot be turned off. They are considered safety/security lights, and even remain on when the power is lost (fed by a generator). Something like this could likely be less expensive than the electricity used to keep them on all the time. They would likely give off less light than a normal bulb, so you would need more of them, although the security lights generally run dimmer than normal anyway.
I definitely agree that you won't see these in the home very often - they are more useful for certain industrial situations, and even there, their cost is such that they won't be replacing all florescent bulbs anytime soon. However, I don't see why they need to be that expensive, and I'd imagine the cost would go down significantly as volume of sales go up.
Don't put it in the room where you sleep. Or for that matter your TV room.
And if you still live with your mom, that could possibly be the same room..
"Victory means exit strategy, and it's important for the President to explain to us what the exit strategy is." G.W.Bush
There's more detail on what he's doing with Patent 6,917,154. It's definately not a hack, it's just a new (and obviously expensive) process. Interesting quote:
The after-glow phosphor of the scotopic after-glow lamp of the present invention is selected with a hyperbolic decay rate dropping to approximately ten (10%) percent of its initial brightness in about six minutes and to one-tenth that in an hour.
Anyway, read up, interesting stuff.
Gonzo Granzeau
"Nothing the god of biomechanics wouldn't let you into heaven for.." -Roy Batty
if the tube breaks, not only can you use the shards for lighting for the next hour or so, you can also easily dispose of the shards too (well duh, theres no lighting and all the pieces of the tube are glowing :P)
Viable Slashdot alternatives: https://pipedot.org/ and http://soylentnews.org/
How incredibly new! *sarcasm* I think a lot of us had glow in the dark stars when we were kids. What I'm curious about is if they were able to increase the intensity far greater then those glowing pieces of plastic.... Nothing to see here. Move along.
In undeveloped countries, the consumer controls the market. In capitalist America, the market controls you.
It really depends on the life of the bulb. If it's super long on the order of years, then it's worth it. But it's a standard bulb life, it's better to stick with normal response equipment.
Gonzo Granzeau
"Nothing the god of biomechanics wouldn't let you into heaven for.." -Roy Batty
There's a serious lack of actual data in the articles, but my suspicion is that by putting glow-in-the-dark stuff on the inside of the tube it benefits from all the extra UV that you get inside the tube.
A fluorescent lamp glows by discharging electricity into a gas which then gives off UV. The phosphorescent coating inside the tube takes the UV and turns it into light.
The glow-in-the-dark strips also respond to UV light, but in a way that stores and releases the energy later. You could just put up strips, but only a tiny percentage of the UV light from the tubes would hit them; the rest would leak out into the room. (And they're designed to give off as little UV as possible, since it's unhealthy and wasteful; you want it as visible light.)
So by effectively putting the UV strips inside the tube, you charge them up when the light is on. You'd have to cover the walls with UV strips to get the same effect outside the lamp.
For everyday people? Probably not. Not in your home, at least, where you probably want it dark when you turn off the lights. But in office buildings, these could be a nice alternative to the emergency lights that are required in most places. No extra wiring; you just fit fancy bulbs into the existing fluorescent fixtures.
I have one in my bedroom here in Japan for the last four years. It is a ring florescent tube that glows like a night light after the light goes out. The light is made by NEC and is called Hotarukku (a play on the word hotaru, which is Japanese for firefly). It seems they launched the product in March 2000. http://www.nelt.co.jp/navi/la_shg/fre_shg.htm (Japanese) gives specs and has some pics showing the room lit with the light on and off.
This is a solution desperately looking for a problem. It isn't even a good one. It could only work in basements and office buildings, at night, if there are no windows nearby. (I presume you would be able to see your way around by the steady glow of the raging fires shining in through the broken windows.)
This was indeed a hack and so is the guy.
Didn't he ever ask himself "Why?"
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Yay. So now I wont need an extension cord when I play with my light saber any more. Because we all play with a light saber now and then, right guys? Guys?
5 times what the standard tubs cost? That's alot of money for a light.....
Honesty may be the best policy, but by process of elimination, dishonesty is the second best policy.
Since radium and tritium aren't allowed to be sold in something as fragile as a fluorescent tube, they probably use zinc sulfide as their phosphorescent material. Zinc sulfide MSDS says "Irritant. Harmful if swallowed due to the generation of hydrogen sulfide." You'd have to eat quite a lot of broken tube debris to ingest enough to develop a harmful concentration of H2S gas. Obviously, the glass shards from the broken tube pose a far greater risk than the phosphorescent materials inside.
If a job's not worth doing, it's not worth doing right.
By turning the light on and off and using the afterglow would it be possible to get a lower overall energy usage?
Helping with organizational effectiveness is our job.
The vapour in fluorescent tubes is mercury (Hg). Very bad to breathe, and perilous to touch too (unless you wash hard, and even potent cleansers aren't designed to remove heavy metal contamination).
That's why they need phosphorescent coating in the first place: the excited Hg vapour emits UV, and it's actually the phosphors that 'fluoresce' visible EM.
Competent safety procedures include vacating the area of a fluorescent bulb break for at least ten minutes, followed by thorough cleanup and HAZMAT disposal of the materials used.
This will work great when the water-based fireplace blows a breaker!
One obvious (at least to me) use for this that no one has mentioned yet is energy conservation. Just turn on your glowing fluorescent light, let it charge up, switch it off, and Ta-Da! you have light without using electricity for about an hour. True, the light is much weaker than standard electric lighting, but it is a step in the right direction.
A company produces an interesting variation of a product that has been mass-produced for decades, and it's called a hack? And how did you manage to get your shiny new favourite word, "terrorist" in a summary on flourescent tubes? Let me read that again. Interesting story, puerile summary.
My motorbike travels in Chile.
They make great light sabres!
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Given that normal tubes have a drop of mercury within them (mercury vapour, when excited, emits UV light which the coating converts to visible light), how "safe" are normal tubes?
-- The universe began. Life started on a billion worlds...
-- Except on one where stupidity was there first.
those were filled with petrol
After reading the tedious patent, apparently they are using strontium aluminate, not zinc sulfide. The toxicology on strontium aluminate is "This product is non-toxic". It's also reactive only with acids, and doesn't burn. Basically, about as hazardous as dirt.
If a job's not worth doing, it's not worth doing right.
for the 100th time,it is difficult to compare costs for a commodity item produced in the dekamillions to something new.
does it involve gasoline and soap? 'Cause if so, it's been done and it doesn't work too good.
Schrodinger's cat is either dead or really pissed off...
I'm guessing strontium aluminate - it glows for a much longer period of time than zinc sulfate.
It's a shame that tritium isn't more widely used in the US. The phosphor and glass container do a pretty good job of mopping up the radiation, and it's reasonably long-lived. Should the container break, the gas dissipates quickly, and because it's so light, it won't settle near the floor of an enclosed space in any real concentration.
Please stand clear of the doors, por favor mantenganse alejado de las puertas
Problem: Domestically produced commodity items are no longer cost competetive in the marketplace. Increased competition from overseas manufacturing is producing insurmountable pricing pressure on commodity items. Company is approaching insolvency.
Solution: Minor cosmetic changes to commodity product manufacturing process. Re-write marketing material to reflect the change, emphasis on the 'terrorist' application. Increase sale price dramatically to reflect the new 'terrorist' application.
Results: Small increase in sales volume, substantial improvement of product margins. Financial insolvency averted.
Conclusions: Terrorist hysteria is an effective marketing tool. Properly exploited in the marketing literature, the terrorist hysteria can breath new financial life into any product that is no longer producing adaquate margins through traditional channels.
Future Risk Analysis: A fundamental shift in marketing strategy brings with it inherent market risks. The major risk of this conceptual change is that the public mindset will begin to discard the 'terrorist threat', rendering increased marketing efforts in this area ineffective. This risk is deemed minimal at this time, the majority of the expenditures required to maintain the public mindset are being undertaken by the federal government, with a virtually unlimited budget for this marketing effort. This paradigm shift by our company is essentially parasite marketing where our relatively small marketing budget is being used to leverage the expenditures of the federal government. This strategy should remain effective for a minimum of one election cycle, so we should see improvements in the bottom line for at least the next 10 quarters. The primary risk moving forward is that the federal government expenditures to promote terrorist hysteria are reduced, with a resultant loss of marketplace mindset for this strategy. This is a relatively small risk moving forward, and partially offset by hundreds of companies such as our own, all focussed on re-working marketing strategies to promote and extend the terrorist hysteria.
Recommendations: Marketing budget needs to be re-allocated. Television advertising should only be purchased on networks whose news organizations properly emphasize the terrorist threat. The same for print media advertising. The marketing department needs to re-allocate human resources, emphasis on 'product efficiency' needs to be lowered, with appropriate staffing reductions. A new team needs to be established to emphasize the 'security' aspect of the product. A 'threat analyst' should be hired, and put in charge of this new team, who will be responsible for producing white papers emphasizing the 'security' aspect of the product, with particular detail on the 'terrorist' aspect.
Sheesh! Those Japanese have a different word for Everything!
I wonder how much the (powered) light output is diminished for a feature that will be used for a vanishingly small part of the useful lifetime of each tube...
...make floursecent tubes that emit a decent color and intensity of light I might consider using them.
It seems that the use of the word 'hack' is sufficient to get any bit of product development on to /.
This article is an example of product development, not a hack!
In terms of annoying flicker from fluorescent lights, this will be like adding a capacitor across "noisy" DC current to smooth it out -- fluorescent light will have smoother, more natural look without the headache-inducing flicker.
Possible uses: Nightlights - turn the kids light off and it glows for a while so they go to sleep (you'd still need the little light on the way to the bathroom). Folks are willing to pay extra for baby stuff. 1 out of 5 (or 10) of the lights in a commercial or institutional (esp schools) setting. I was in a cubical farm the other day and the lights went out. A few glowing tubes would have made it much more pleasant for folks to sit around goofing off. Stairways. Hospitals - the one I worked at had to work on rewiring areas to provide emergency lights. This would be cheaper.
Yes, but being radioactive alone isn't a big deal. What's the half-life and what type of radiation does it emit?
Keep in mind that some "radioactive" materials are so harmlessly radioactive (most commonly depleted uranium) that they can be used as radiation shields around stuff that is dangerous.
This could also be used for energy savings - you don't need to supply power to the lamp continuously. Power off the lamp and still get the illumination for a while. When it gets dim, turn on the power again. Put in a timer circuit and it happens automatically. Assuming you could do a 50% on 50% off cycle, you've automatically doubled the efficiency of the lamp (by reusing UV energy that was otherwise lost).
The lamp pays for itself. Your energy sources last longer. The world is a better place.
cat
No, the isotope Strontium-90 is radioactive. "Regular" Strontium is not.
(and used in french toothpastes for sensitive teeth, for some reason. French sensodyne brand toothpaste works much better than English sensodyne brand toothpaste, but the English sensodyne brand toothpaste isn't slowly killing you...)
Strontium chloride is about as dangerous as table salt. You really ought to research things rather than drawing half-baked conclusions from inaccurate data.
If a job's not worth doing, it's not worth doing right.
That was my first thought on reading the summary. I really hope my boss doesn't read Slashdot today...
The company I work for actually had a competition a few years back to find the best suggestions for cost-cutting. The person who won the trip to a World Cup Soccer match actually suggested we turn the lights off in the office at night (when there's nobody there!). At the time we all joked that if they hadn't thought of that they evidently had bigger problems than cost-cutting...
If these lights could be made to provide a higher percentage of the "power on" light, and last for a little longer, I could really see the bean counters going for this.
And that kids is how I met your mother.
they can also be removed from their fixtures and carried around
Great!!! My "Christopher Lambert in Subway" Halloween costume is complete!!!
This sig intentionally left justified.
cool as this sounds, its over engineered, a recharble battery and battery powered bulb could do the same.
I sense a large number of Star Wars related accidents in the not too distant future.
This guy isn't worried about glass shards...
And the people shall be oppressed, every one by another, and every one by his neighbour Isaiah 3:5
I hate existing flourescent bulbs. They give me a headache. This phosphor which glows continuously should help to reduce flicker.
Even a much shorter-lived phosphor would be good: If one could develop a phosphor which decays at about the rate that a lightbulb filament cools down, then we get both flicker-free lighting AND essentially instantaneous turn-off.
As a former submariner, I can attest to it's usefullness on a submarine. The only places that are dark are berthing, and Control, if we are doing night ops. The cost isn't prohibitive on a submarine, so that doesn't matter. There already is a emergency lighting system in place, that runs of the battery on loss of AC, but it would be great to not need that right away, and save some of the juice in the battery.
Finally we get those cool umbrellas from Blade Runner.
A man in England has some different ideas concerning the fluorescent tube.
Seems kinda dangerous - not something that you should try at home...
Nothing sucks like a Vax, nothing blows like a PowerMac G4
Sorry, fella. But seriously, there is prior art to this one.
Read on...
In March 11, 1986, a college dormitory had a power outage in the middle of the nite. Imagine a hallway without windows, just dorm doors.
Anyway, there is a lone light fixture that illuminated the middle of the hall. Naturally, like moth, students began to congregate around the lite.
It remained bright enough for some of the students to hold conversation in sign language.
It stay alit for four hours before the power was restored. More than 10% of brightness remains.
So, I swiped the tube... I still have it...
...a short story by Philip K. Dick called "Foster, You're Dead". Find a copy and read it, it's good. It's about a kid during an alternate-reality cold war whose father refuses to buy a nuke shelter. Wikipedia Link
---
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Why is it that when you believe something it's an opinion, but when I believe something it's a manifesto?
The problem with neon is that it glows orange. The solution has been to use mercury vapor which emits ultraviolet and coat the inside of the tubes with a florescent material to bring it down to visible (and mostly white) light. I'd say the real achievement here is getting a mostly white glow-in-the-dark phosphor. You don't really appreciate white light until you have to deal with odd colors a lot. I pity those who work in "dance"clubs.
Can you be Even More Awesome?!
I don't know why, but I'm laughing out loud over this. I wish I had mod points.
DJCC
Mod parent up +1 Zork Reference
If you like what I've said here, and want to read more, go to http://www.krillrblog.com
or am I missing something by not reading the article?
I bought a blue compact fluorescent bulb a while ago for no particular reason. When switched off, the bulb continues to glow perceptably for a couple minutes. It's not bright enough to light up the room, but it looks really weird. I hope the bulbs mentioned in the article, which I haven't read, glow a little brighter.
This will completely ruin the premise of shooting out the lights in Splinter Cell!
--I smoked my sig.
The SrxAlxOx is not the important part though. It is what is DOPED into the strontium aluminate that is important. Note that is says Sr4AL14O25: Eu Dy. That means dysprosium and europium are doped into the matrix of strontium aluminate. THESE are the important dopants which are responsible for the extremely long phosphorescent glow times.
- "Hear that?! The percolations are imminent! Cease your ingress!"
do they come in flourescent red?
Indeed, an important point to be sure. Strontioum-90, though, is a pretty nasty character. Half life of 28.78 years, very high energy beta particle emitter, and it readily substitutes for calcium if ingested, so it sticks in your bones and doesn't leave.
If a job's not worth doing, it's not worth doing right.
Where you look at it and think,
`Well gee whiz, why didn't anyone do this before? It's so obvious.'
It's like when you're a kid and you're trying out your new watch with the glow-in-the-dark hands by holding it up to the light and then turning the light off to see the neat little dots.
It's like the ball-bearing. For years grease, at first animal and then more refined, was used to keep wheels from burning on axles, probably after a carter with roast pork or chicken greased fingers had to make an emergency repair.
Some years later, bullets are being made for muskets and early pistols by using molds, and dropping small amounts of lead down the inside of a tower into tepid water.
What was the thing that triggered the mental connection between wheels and balls to allow the wheel to spin much more freely?
What was the trigger that prompted someone to look at a fluorescent light bulb and think,
`Hey, if we put some sort of glow-in-the-dark shit in that, it'll work even when it's off!'
I love these little inventions because you never really think about them and make the connections, but then once someone does, it all just seems so simple and obvious.
I think it's a perfect example of the humorous theory that ideas are just out there, like bits of benign radiation just zipping about the cosmos, and every once in a while they pass through the right person's head and trigger off all the right neurons to germinate that idea inside that person's mind.
`Eureka!'* He cried as he leapt from the bath, his face aglow with sudden clarity of thought.
* `Hand me a towel!'
His name is Robert Paulsen...
THIS IS THE WORST IDEA EVER! this is why: WHEN YOU GO TO SLEEP AND YOU TURN OFF YOUR LIGHT....IT WONT TURN OUT!!!!!~!! YOU'LL NEVER SLEEP!!!!! that hard cover better have a snooze button taht makes it go black, or else this will become quickly the "worst idea ever."
The only downside I can think of right now is that the effort needed to scrape off the coating and later reseal the tube might exceed that of just making a vacuum tube designed for the task in the first place.
But I love this kind of grass roots recycling thinking!
These would be great for lightsabre battles! Much better than pouring gas inside of one anyway... but you'd need to wear gloves.
:)
Really though, regarding the post, does everything need to be related to terrorism? Isn't that just a marketing ploy? Don't we already have our anti-terrorist duct tape at the ready?
"I have never let my schooling interfere with my education." - Mark Twain
Indeed, an important point to be sure. Strontioum-90, though, is a pretty nasty character. Half life of 28.78 years, very high energy beta particle emitter, and it readily substitutes for calcium if ingested, so it sticks in your bones and doesn't leave.
Thank you for the clarification, and yes that's pretty bad. High-energy beta radiation coming from your bones for decades? Ack. Wouldn't want that anywhere near me.
What ever happened to this fluorescent light bulb hack? I'd pay good money for x-ray specs, even if they are 3m long.
The human body sees strontium as if it were calcium.
This could cause harm by being incorporate into bones, used in cell signalling, etc where calcium would be.
I'm not talking radiation, but the fact it mimics calcium, yet is chemically different.
There may be a risk, or there may not be. There is at least a theoretical danger.
Just because it CAN be done, doesn't mean it should!
If the new material absorbs the UV light and releases visible light more slowly, doesn't that mean that the outer coating on the bulb has less UV to absorb for itself?
Also read a more informative piece in http://www.drhoffman.com/page.cfm/444 which references "Strontium ranelate boosts bone density in elderly women" from N Engl J Med 2004;350:459-468. This article outlines different forms of Strontium that have been used in medicine, and their effects. Looks like Sr actually aids in increasing bone density, and tooth integrity.
BTW, Sr-90, being a good beta emitter, is used in nuclear gauging. Years ago I maintained and calibrated Betamike(TM) gauging systems measuring extruded plastic web from 0.010" up to approx. 0.100" thick (control system maintenance only; we farmed out all the 'hot' work).
Sr-90 (28.78 yr half-life, pure beta emitter) breaks down to Yttrium-90 (64.1 hour half-life, also beta), then to Zirconium 90 (stable). Does a good job, but, after 15 to 20 years, and enough of the the source has changed to Zr it is necessary to boost amplifier gain pretty high resulting in a poor s/n ratio.
While checking my facts ran across this useful page which goes into some detail on nuclear weapon physics, and what the byproducts are for a typical fission device. http://www.cartage.org.lb/en/themes/Sciences/Chemi stry/NuclearChemistry/NuclearWeapons/FirstChainRea ction/EffectsNucl/WeaponEffects.htm
Those who sacrifice security to condemn liberty deserve to repeat history or something. - Benjamin Santayana
Those who sacrifice security to condemn liberty deserve to repeat history or something. - Benjamin Santayana
The first thought that came to me was a "night light."
Basically, you could put this in your kid's room, and it would act like a regular light. When bedtime came, you'd shut off the light, leaving the glow. Your kid could get some sleep, and then the glow would go away.
Or the lights would cast an eerie glow on your kid's toys, traumatizing him/her for life. Whatever.
which, in a way are even more retro-cool since many of the first computers used LED readouts, so it's like a wayback machine to the real future.
-- Tigger warning: This post may contain tiggers! --
But there's no relation whatesoever to those strange all nigth on lighths...
The only place I have found it is in some emergency exit signs, It may be possible to pay the makers of these to make something like a Glowring (item I'd love to get my hands on).
Well I've wrestled with reality for thirty five years doctor, and I'm happy to say I finally won out over it.
It looks to me (and others) that by Colorado firm they mean NEC Lighting of Japan.
Well I've wrestled with reality for thirty five years doctor, and I'm happy to say I finally won out over it.