ESL — a CRT-Based Replacement For CFL Lights Without the Mercury
New submitter An dochasac writes "Everyone knows incandescent lights are inefficient little space heaters which happen to convert 5% of their incoming energy to light. Compact Fluorescents (CFLs) are more efficient, but they contain toxic, brain-eating mercury and emit a greenish light. LEDs are also efficient and last longer, but if their blueish 'white' light doesn't mess up your melatonin balance, their price is high enough to wreck your checking account balance and give you the blues. A company called Vu1 has come up with something called Electron Stimulated Luminance (ESL) lights which claim to solve the mercury and price problem with a light based on Cathode Ray Tube (CRT) technology. These lights have the warm color balance of incandescents and are compatible with dimmer switches. The article has further ESL details along with an explanation of why it's still a bad idea to say these are 'trash can safe.'"
My first thought: English as a Second Language light bulbs?
But we're finally trying to improve the lightbulb again. Thanks, energy crisis.
http://en.wikipedia.org/wiki/Electron_stimulated_luminescence
Slashdot needs a copy of the wiki alertbox: "This article appears to be written like an advertisement".
"Light is generated instantly when power is applied." So how are they doing the thermionic emission of electrons... cold cathode which I thought had serious amps/meter limits, or ?
"Science flies us to the moon. Religion flies us into buildings." - Victor Stenger
they're highly efficient space heaters
There are still good uses for incandescents, particularly in environments where the heat is a major benefit.
As an example, my wife's theater group has a detached wooden shed which is used to store costumes, wigs, etc. She keeps a 60-watt light bulb burning in that shed to keep the place warm enough that condensation and mildew aren't a problem. Since the bulb hangs in open space from the ceiling, it's a lot safer and much more efficient than any space heater, and it's also cost effective, since, as noted, it keeps mildew down.
A light bulb with no "native resolution!"
You can get LEDs in any color balance you want now, including very warm color balances. For example:
http://www.cree.com/products/xlamp_mtg.asp
And price is falling fast:
http://en.wikipedia.org/wiki/Haitz's_Law
The lighting industry is rapidly gearing up for a complete transition to LED lighting.
The melatonin study? The comparison point is high pressure sodium, which produces very yellow light. I'd be surprised if there is anything specific to LEDs as compared to any other light with decent Color Rendering Index, other than that they are efficient enough to be a candidate to replace High Pressure Sodium.
I just discovered a use for that old CRT monitor buried in my closet!
Now I can be sure that my lighting solution can deliver true blacks for better contrast
This is my signature. There are many like it, but this one is mine.
You can get your choice of color temperatures from a fluorescent: they make different phosphor mixes for different applications.
LED lights can even have their color balance changed on the fly.
I go out of my way to find daylight or cool-white bulbs. I have been living with cool white for over 10 years and when I see a regular incandescent bulb outputting that putrid yellow color, I cringe. It is awful. This is the year 2012. Why do we still want our artificial light to be the same color of candles used back in the stupid ages?
LEDs are about ~$30 on amazon. They've dropped about half what they were two years ago, so not really that expensive (they last a lifetime). I'm tempted to buy one sometime.
CFLs:
- are dim for the first 4-5 minutes, so you have to sit and wait before you can read your book (or walk down the basement steps)
- filled with mercury
- have to drive the burned-out ones to the landfill (thus increasing carbon footprint) (and no I don't CFL or battery recycling where I live)
- have to ship them in from China (again increasing the carbon footprint)
- they don't last long in my fixtures because they are upside down (trapped heat kills CFL electronics)
- or startup when outside (subfreezing temps)
- and every dimmable CFL I've ever tried went "zzztt" and died within an hour.
I wish the incandescent bulbs were still available. They didn't use as much power as the CFLs do (I'm including the power to ship from China & drive them to the landfill). Or frustrate me. Or require special handling. And they were built here on this continent (close to market).
My AC stalker: " I personally agree with your posts most of the time, but that won't keep me from modding you troll"
At least if you pull down the blinds. But then, so are all other electrical heaters, and indeed pretty much most electrical equipment. Light, and all other radiated energy, all ends up as heat in the end. The only difference is how a heater distributes the heat, and and how convenient that process is.
Reverse-cycle air conditioners are an exception, as they're heat pumps, not radiators.
Why would anyone engrave "Elbereth"?
But we're finally trying to improve the lightbulb again. Thanks, energy crisis.
I'm not sure that they know what they're talking about when they say the "bluish 'white' light" of LEDs. Maybe five years ago white LEDs had a blue tint, but these days you can buy consumer LED bulbs in about any color temperature you like, including the "warm" light indistinguishable from incandescents.
http://www.geoffreylandis.com
Didn't CRTs have to use leaded glass to prevent the users from being bathed in X-Rays?
Seems to me a small detail or two is being overlooked here.
Didn't CRTs have to use leaded glass to prevent the users from being bathed in X-Rays?
RTFA
The shadow mask stopped some electrons, converting their energy to X rays. To filter these, old TV screens were made of thick leaded glass
Damn_registrars has no butt-hole. Damn_registrars has no use for a butt-hole.
Canada's $0.25 per pound e-waste charge
Canada has used the metric system for decades (switching back around the time the US said they would switch as well). Why would they charge per pound for electronic waste?
Damn_registrars has no butt-hole. Damn_registrars has no use for a butt-hole.
I'm not deeply familiar with the details of incandescent light development, but I was always under the impression that the big challenge was, you know, just making them work at all without burning out in a short time. Did they really work hard to find the optimal "warm color balance" before they were considered successful? I doubt it. I suspect that at the time the critics were going on about the harsh glare of the incandescent lamp and waxing poetic about the superior warm color balance of the candle flame. Fast forward to the modern day, and every advance in lighting technology can't fail to have a discussion about the "unnatural light" emitted by the newer, more efficient technology of the day. Smells like a classic case of change resistence to me.
Personally, I can adjust. Being a pampered westerner, I can't know what it's like to *really* be without light, but I've experienced several long power interruptions, including last year's week-long post-hurricane Irene outage, and I'll take any light I can get, thank you very much. More efficient, brighter, requires less power? Able to produce "normal indoor light levels" from a handheld lantern powered by a battery for a week, but sorry, it's a little on the "blue" side? Who the hell cares?
Please, bring it on.
Their ads claim that it has similar efficiency to a CFL, but that is far from true for the CFL's one finds at Home Depot or similar.
The company's VU1 is 600 Lumens and uses 19.5 watts. (ref: http://www.jetsongreen.com/2011/11/vu1-esl-r30-light-bulb-lowes.html ) This comes out to 30 Lumens per watt.
A typical under $4 CFL from home depot puts out 1500 Lumens using 23 watts for 65 Lumens per watt or more than twice as much light for the same input power. (ref: http://www.homedepot.com/h_d1/N-5yc1v/R-100686995/h_d2/ProductDisplay?catalogId=10053&langId=-1&keyword=100%20watt%20cfl&storeId=10051 )
I wish the incandescent bulbs were still available.
Well, Halogens are technically a special subtype of Incandescents, capable of meeting all your requirements and suitable for use as a drop-in replacement for your beloved bulbs. Power efficiency is only slightly improved compared to standard Incandescent though.
What, no mention of metal-halide lamps? Not a very comprehensive article...
I'm not deeply familiar with the details of incandescent light development, but I was always under the impression that the big challenge was, you know, just making them work at all without burning out in a short time. Did they really work hard to find the optimal "warm color balance" before they were considered successful? I doubt it. I suspect that at the time the critics were going on about the harsh glare of the incandescent lamp and waxing poetic about the superior warm color balance of the candle flame.
They didn't need to work hard to find the optimal balance for incandescents, because it's inherent in their design - they're black body radiators, same as candle flame or sun, so they've got that nicely distributed spectrum that feels more "natural" to our eyes.
The phosphor need not be irradiated from behind so the shielding need not be transparent. If you don't need a long focused beam, you don't need the high voltages either that give the electrons the energy to produce x-rays. I don't worry about the X-rays
The lack of mention of warm up time or cold cathode, nor the efficiency of LEDs, nor the comparison of light out put per gram of Europium vs an LED makes me think they really don't have much to offer.
Color temperature. Incandescents range from 2700K to 3000K. CFLs have just now started to emulate that where before they started off at 5000K (bluish white). Personally, I can't stand first generation 5000K CFLs. You have this bluish white color and everything else in grey shadows. It's like I'm in a freezing cold morgue. How in the hell can people live like that? I prefer burning candles over that shit.
Life is not for the lazy.
A couple years back, I wanted to get some perspective on just how much mercury is in a CFL. After looking up values for a typical CFL bulb, it turned out the entire mercury content of the bulb was equivalent to 4-5 pounds of swordfish.
Not sure if that's an endorsement for the safety of CFLs, or a warning to the effects of bio-accumulation on seafood.
I had been following Vu1 for several years. I moved into a house littered with can lights on dimmer switches. I've tried dozens of CFLs that claimed to be dimmable - at best they didn't dim, at worst they made a racket. I thought these sounded great - I put my name on a waiting list, dutifully put in an order when they claimed to be in production, and have been waiting for about a year since they announced that they were shipping. In the meantime, I have gotten quite proficient at seeing in the dark, so I no longer think I need them.
I can't really see the point at all in why we in the nordic countries would need to change at all ... its stupid as shit since we need to heat our homes 8 months of the year anyway.
... to heat our homes ... which we would have done anyway. The rest of the year we don't use lights indoor that much since we've 18-24h sunlight here anyway.
So what if they incandescent light-bulbs only produce light from 5% of the energy used. The rest go to heat
Damn those benighted fools for having a preference that differs from yours!
Why do we still want our artificial light to be the same color of candles used back in the stupid ages?
Think of the choices you have made in clothing and in interior design:
Materials. Colors. Textures, Patterns --- all will be affected by any change in lighting. You wife won't take kindly if your high-efficiency lamps turn her newly remodeled kitchen and bath into the CSI Morgue.
They didn't need to work hard to find the optimal color balance for incandescents, because it's inherent in their design - they're black body radiators, same as candle flame or sun, so they've got that nicely distributed spectrum that feels more "natural" to our eyes.
Apparently they *DID* need to work hard to find the optimal balance for incandescents because GE charges extra for their "Reveal" line of incandescents http://www.gelighting.com/na/home_lighting/products/reveal_main.htm as other manufacturers do for their bulbs with light in the non-traditional, 5k-6.5k color spectrum.
Never happen. Congress(men) have too much of their wealth tied up in the existing Mercury-based technology.
I like a mix. 6000-6500k for when I'm trying to promote leaf & stalk growth, 2700-3000k for blossoms onward.
Also don't care for that yellowish "warm" light that is sold everywhere, for general lighting - it feels unnatural, may as well be green or pink.
They didn't need to work hard to find the optimal balance for incandescents, because it's inherent in their design - they're black body radiators, same as candle flame or sun, so they've got that nicely distributed spectrum that feels more "natural" to our eyes.
Their inherent behaviour is not an optimal color balance; rather, it's the color balance that people have become accustomed to seeing. For those of us with lots of big windows in our homes, the color of incandescent light clashes with the daylight streaming in the windows.
I am ditching all my CFLs when they die for LEDs. Home Depot sells a bunch of nice ones. They aren't too expensive, and they dim properly. Their Ecosmart ones are the ones I get for most of my lighting because I like the higher colour temperature. For my living room I like the Philips AmbientLED A19. It is a real replacement for a standard A19 bulb. Same size and everything. They call it 60 watt equivalent but I measure the light output to be equal to a GE Reveal 75 watt bulb. Has a "warm white" which I don't usually like but for dimmed TV watching light I like.
It's luminous efficiency if better than CFLs too.
We'll see how long they last but they are warrantied for like 7 years and given they are LEDs they ought to last for about 50,000 hours of continuous use.
Don't believe the lumen per watt shit from CFLs. They tend to be wildly exaggerated in my experience. I have to get "75 watt replacement" bulbs to get near the light of a 60 watt incandescent. LEDs I find the opposite, the "60 watt replacement" Philips bulbs I get measure as bright as 75 watt GE Reveals.
Preference implies choice. I would have to raise a big stink at city meetings to change the eery glow outside my window from all the lights at the Light Rail. I have shades and shut them, but it would be so great if a soft white or blue were coming in rather than that eery yellow glow that has no business happening at nighttime.
Swedish company LightLab [http://www.lightlab.se/en.aspx] has (not very successfully) been trying to commercialize this for years.
Well, true, "optimal" is a stretch - really, the only optimal light source is the sun (or anything that can match its spectrum). However, incandescents (and flame) are still more "natural" to us than LEDs, because their spectrum still has the same overall distribution - just shifted into yellow.
Last century saw genetic selection (aka eugenics) as a way to "improve humanity" after the world was shocked with the new scientific discovery of evolution. I guess this time around the ass holes who think the government's job is to shape society rather than serve society are putting hopes in the new wave of scientific advances to achieve their goals.
Any guest worker system is indistinguishable from indentured servitude.
This is actually an old idea in some ways. For example, apparently the old-fashioned Sony Jumbotrons - the big screens in places like sports stadiums - were built around a similar device. Each color of each pixel has its own electron gun that floods the entire segment of phosphor with electrons, effectively acting as a kind of lamp.
I miss a display that can dynamically change its resolution, and not rely on various scaling methods and stuff.
Also, I would never retrofit an LCD into any of my arcade machines.
You know what's high efficiency, has long term cost benefits and is environmentally friendly?
Sulfur Lamps!
http://en.wikipedia.org/wiki/Sulfur_lamp
Best use, however, is piping the light, as installing them into a room comes with many annoyances, like communication interference and microwave ballast placement. However, I must admit, they have some great uses, and currently, nothing beats them for central lighting...they glow a Fusor Test-fire purple when they first get started; how awesome is that?
"Yeah...it was the numbers that were irrational, not the murderous cult of vegetarians...." -- Hippasus of Metapontum
There's some recent research suggesting that the primary harm from methylmercury is binding with selenium and preventing the formation of selenocysteine, which is an important amino acid in proteins that mop up oxidative graffiti artists and/or their handiwork.
In fish sources with a fair balance of MeHg and Se, the health outcomes of eating the fish outweigh toxicity. Fish sources such as Pilot whale with a lot of MeHg and almost no Se are really bad for your nervous system.
It might be time to downgrade the notion that Hg is a universal toxin. For thalidomide only the (S) enantiomer is teratogenic. What I didn't know until just now is that it's racemic in vivo (the enantiomers interconvert, but the en.wiki article didn't say how quickly or thoroughly).
As etiology advances, you need to keep an open mind. We should be more like the far right: Khamenei gives way to Saddam, then to Ossama, back to Saddam, and now Ahmadinejad. A nice passing play with assists all around.
Actually you're thinking CRI, not temperature.
High CRI 5500K bulbs look damn good. In TV studios they normally use between 5500K and 6500K - all high CRI of course. LEDs there are considered awful and only used for color accents. Cheap CFLs are even more awful than LEDs in CRI. :-)
At producing light and heat. The climate in the USA, at night... you know, when people use lights - almost always requires heat. So, in the deep South, summer time - when you have 100W bulb and the AC running, you have a point. But if you calculate on only that loss, these hateful ugly bulbs don't compare. But, that didn't stop the Feds from taking your choose away. So if you are a wealthy and looking for a Ferrari, buy one soon - if they can outlaw buying the bulbs you want and can afford to light - just because you like them - they they can stop those purchases to. Image, everything in life can fall into that category - until the population gets pissed and votes these power hungry dorks out of office.
CFLs have been available in 2700K (Warm White), 4800K (Cool white) and 6300K (Daylight) variants for at least 10 years.
Wow, a farticle for a pump-and-dump delisted stock from a first-time submitter makes it to the front page.
Slashdot, you've reached new highs.
Yes, LED bulbs are twice as expensive as ESL bulbs *to buy*, but they last up to 5x longer and use HALF of the electricity of an ESL bulb per candela. All told, each LED bulb saves me over $300 during its lifespan over incandescent. ESLs would only save me about half of that.
As for color, I just installed 6 LED 10W recessed lights in my office/studio (Home Depot Ecosmart). The color is a warm 2700K, they are plenty bright (65W equivalent each), and they dim down to almost nothing with no flickering.
Sure, ESL is better than CFL or incandescent, but if you're going to invest in a bulb long-term, the LED is a much better buy even at their current price than a gussied-up CRT.
It's not much mercury and it's not going anywhere sealed in glass, just save them up. If you want to get a less alarmist perspective do some numbers - look up on the net how much mercury is actually in a bulb, look up how much is in an old thermometer and work out how many thousand bulbs you need to show 1 degree of difference on a thermometer.
Since mercury isn't that common in coal outside the USA and the US has scrubbers to get the NOx and SOx out of the flue gas it's not really a lot. Scrubbers work by using a huge amount of water, and it's a hell of a lot easier to remove mercury as a really heavy condensed solid (the vapour solidifies in contact with water) than NOx and SOx as a dissolved gas. So if the scrubbers are getting much NOx and SOx at all it's a safe bet that it's getting all the mercury.
On the other hand, a small percentage of the coal burnt in China has mercury in it and a small percentage of vast amounts of coal adds up. While China is doing something about air pollution it's going to be some time before it's at levels we'd consider safe in some places.
Night light deficient in short wavelengths preserves your circadian rhythm better than cooler, bluer light.
Of course, as many others have posted, it's easy enough to get a warm LED now. I'm hoping someone will come out with a dimmable LED that shifts toward a warmer color balance at lower levels -- that particular incandescent "feature" is a good match for my usage patterns, where I use dimmer light when it's later and I don't want to wake myself up. The difference, of course, is that the LED wouldn't have to drop to sub-1% efficiency at low levels.
The flicker of CFLs is as bad as the flicker of fluourescent tubes. Both give me migraines.
Maybe these new ESLs won't cause the same problem. I know LEDs don't, but the landlord isn't willing to pony up the extra dollars for them and I'm hardly going to invest that kind of money in bulbs that I have to leave with the apartment (under Saskatchewan law, if you attach something to the walls or elsewhere, you're supposed to leave it behind as an "improvement" to the property. Of course most people don't leave their shelves and stuff behind, but legally you're supposed to.)
I do not fail; I succeed at finding out what does not work.
Maybe he has a classic/antique one?
Remember 're-use' is part of being green. Buying a new oven wastes more resources than simply buying a new bulb. Though from your report the new one bakes more evenly.
I don't read AC A human right
LEDs and CCFL have one huge advantage over incandescent: you can have lots of them.
You know, I think this is the critical point. I used to live in a century old house. How old was it? It used to have gas lamps. Now, you have to treat gas lamps differently, they were mounted on the wall within reach. When they put electric lighing in, they simply swapped the fixtures. Still, the ideal placement for incandescent bulbs is different than for gas lamps. It's the same for FL and LED, as you mention. CFL is an attempt to stuff FL into a incandescent sized and shaped package; tubes are more efficient, and light just as well with a modern ballast and quality tube.
With Incandescent, you generally want to go as big as possible - the bulbs get more efficient as they get larger. With CFL, the light per square inch of bulb surface is often lower, but you can make the bulbs almost arbitrarily long. 4' is common, but so isn't 8'. People tend to not like early CFLs in the home due to the possibility of flicker and lousy color, but I've been seeing them more and more, especially in kitchens where you want even light. With LED - individual lamps can be *Tiny*, and the power demands aren't great. Still, they tend to be spotlights compared to the floodlights of FL and Incandescent. Directional. So I could see a track of them pointing every which way to give an overall even lighting, but that will look odd until people get used to them.
In the end, lighting fixture construction and placement will have to change to take the quirks of the new lighting systems into account.
Personally, I installed a ring FL fixture in my bedroom - gives a more dispursed light than what the old fixture gave.
I don't read AC A human right
I find that comment odd, seeing as how both FL and LED produce 'white' light the same way - by exciting a mixture of phosphors that each then emit various colors of light in narrow bands, but the mix has been designed to appear white.
The phosphors are why white LEDs look yellow when off. It's really a blue/UV LED under there.
Now, I'd believe that they tend to use MORE types of phospher, giving a superior white, but you can buy flourescents that use a wider phospher mix to give a better color index as well.
I don't read AC A human right
It's a bit diffuse, and depends on the region, but here goes: ;)
1. Most power in the USA is generated by burning coal.
2. While regulated and producing less pollution than ever, the sheer scale at which coal is burned means a lot of pollution. Remember acid rain?
3. Running an incandescent light bulb when more efficient alternatives are available means more coal burned, more pollution in the atmosphere, millions of people breathing the pollution emitted from the coal burned to produce the electricity to light the bulb.
4. Because it causes harm to others, it's like dumping sewage on your neighbor's lawn; just spread out so that it's a microscopic amount of sewage on each person's lawn. Though at this point it breaks down because 'sewage' at that dillution level often equals 'mild fertilizer' which will make the grass greener.
I don't read AC A human right
Right there, we have reason number one why dumping sewage is not like turning on an incandescent light bulb.
*shrug* It wasn't mine originally, just trying to explain the train of thought. To make it closer, it'd be more like him dumping his untreated sewage into the river you get your drinking water from. Sure, there are treatment systems YOU can use to render said water clean & safe, but it's more expensive for you than him simply cleaning his wastewater up before dumping it. In real life it's actually a mix between the two - he cleans up his water 90% or so, to the point that it's indistinguishable from the river water(that has animals and fish peeing and dumping into it all the time), and you do the necessary treatment to make it drinkable.
So the coal burning plant is the problem, but we're not going to do anything about them.
I was getting a little distracted in my writing there, wasn't I? If you've seen my posts around in nuclear threads, you'll find that my proposed electrical generation system is 40% nuclear, 20% wind, 20% solar, and 20% 'other'. If I had my 'Evil Overlord' ways, we'd be on a crash project to replace those coal plants with nuclear. One of the reasons I'd be doing so is that I've estimated that replacing everybody's vehicles with electric cars would result in about 50% more household electricity usage if they all charged at home. It'd also be a great way to even out power usage, so more baseload plants would be good. BTW, this would overwhelm the difference in electricity usage via lighting.
As for acid rain, well, it 's an excellent example how some fairly easy directed regulation can fix the problem. For not much more electricity cost, we can get the acid problem down to reasonable amounts.
That means both that they have the legal tools to intrude in situations where they think illlegal light bulbs may have been traded, and the legal means to punish people who trade or use illegally obtained light bulbs.
Getting a little paranoid, aren't you? People traded in 'illegal' high flow toilets for years, nobody really got busted. It's mostly enough just to keep local stores from carrying them.
So what's more important? Undetectably better air quality or human freedom? I think the latter.
It's only undetectable on the single bulb scale. Scale it up to millions of light bulbs and you can detect the differences.
Personally, my solution would be to just charge the coal(and other) plants for any pollution they release. None of this 'carbon trading' nonsense, that's just a way to hand profit to non-producers/conserve the polluter's pie. I'd just tax X per ton of lead, Y per ton of mercury, Z per ton of sulfer, and so on. If we decide the air or water is still too dirty, ratchet the offending pollutants up by 10% or so.
That encourages a clean environment with minimal 'personal' invasion. If an economic activity is worth the pollution, it's just not practical to stop it, you pay the fees and move on. If it IS economical to control the pollutants, even if it's with a multimillion scrubber system, you install the scrubber system and avoid the fees. You don't grandfather polluting plants in, discourage upgrades where you'd have to bring them into emission standards at the same times(vastly increasing the price), discourage NEW plants that have to compete with older polluting plants, etc...
Especially for airborne pollution that can make it across the seas, I'd charge the fees on the pollution caused by any imported products as well.
There's no vast pollution problem to fix.
By who's definition? Last figures I've seen place deaths due to air pollution in the thousands per year.
I don't read AC A human right
I hate CFLs for the following reason "The 5000 hour bulbs fail after about 6 months of use, because we turn them on and off about twice a day (For light at breakfast, and after supper). The CFLs have filaments that need to heat up the vapor in the tube before glow starts. The filaments fail.
Here is another problem for we who have very cold winters. These lights cannot work outdoors if it is around freezing. They will not start. Only leds or filament bulbs work.
So, we are back to incandescents for the following reason.
In winter, the bulbs contribute to the heating in the house. In summer, with the prolonged daylight hours, they are not used much (perhaps 1 hour per day).
I live in Montreal Canada, and our electricity is water generated from James Bay. Thus the province has the majority of the 3/4 million homes and all the millions of businesses heated and cooled with electricity. If I switch to gas for the furnace when the temp is around 0F, and use electricity when warmer, my rate is $0.04 cents.
If I am with fully using electricity, without resorting to gas, my rate is 7cents. Incandescents are the best deal. The bulbs last a few years before failing.
Leslie Satenstein Montreal Quebec Canada