That's a surprise to me that there are that many, but not entirely. As we get more solar and wind, HVDC will probably become the choice for transmission, it only makes sense. Market penetration of such, however, is still fairly low.
See that nice long run of LED on the bottom row near the end of the video, the one with more red output?
That's 24VDC.
Two meters down, meter shows a drop from 24VDC to 18VDC. From there, the LED units began getting very, very fucking hot as resistance in the conductor increases.
And I bet you wonder why you have a lonely life. Because if you can't trust any group or associations of more than one person, you're obviously not going to parties, events, or anything like that.
The spiral CFL was invented in 1976. In 1980, Philips introduced its model SL. That's right next to 25 years (and jives with the statement 'approaching 25 years old.')
DC is only the preferred transport over large distances at HIGH VOLTAGE.
You've already disqualified your own remarks, sir. And I've worked in power generation stations. Almost 100% of America's power grid is AC. The only DC line we have is an HVDC line in California, and even then, it's used to transfer power between unsynched AC systems, and not power homes directly.
"I was looking at LED replacement bulbs at the hardware store the other day ($20 each). I am suspect as to their efficiency. They have large heat sinks on the which get very hot."
Welcome to thermodynamics. LEDs are roughly 40%-ish efficient. That means about 60% of your power is getting dumped as heat.
"There is no way to pack an efficient transformer into such a small space."
I can tell you don't design or wind your own transformers. In fact, you don't need a transformer, all you'd need is a mini variac.
" Houses need wired seperately with a lower voltage appropriate for powering LED lights"
FUCK NO. You're trying to push DC over a distance of greater than two meters. You're going to lose more energy trying to just send the power down the line to the bulb than you will ever save dropping down. Do you even know why we use AC for roughly 95% of the world's power transmission?
"You can install a high efficiency transformer to step down the 120V into a clean, lower voltage signal but that transformer is not going to be cheap"
Please go take an electronics engineering class or two.
"Furthermore, a lot of dimmers are not rheostatic, but instead work by modulating the "pulse width" (for lack of the proper term) of the A/C waveform."
You don't PWM an AC waveform. You PWM a DC output (as it has no waveform, it peaks and stays peaked.)
"an LED light is only likely to work if it has some sort of way to convert the pulse width to relative current level (such as via capacitors)"
No, PWM dimming is caused by a PNP transistor circuit, not a capacitor. Do you even know how a capacitor works? On a DC output side for LEDs, they're almost exclusively used for decoupling. On the AC side, typically used as a power filter/smoother.
"every one that I've purchased - from multiple companies - has burned out prematurely. "
Yea, and I'm willing to bet you cheaped the fuck out on them, plus installed them in areas where you shouldn't have. I've got my entire house lit with LED. I have designed LEDs that run off of RAW AC and require no power controlling circuitry, just a heat sink. And those AC LEDs of mine have already gone almost 8 solid months now without one single problem. I've got hacked and cracked panels out the frame lighting aquariums, growing plants, and much more, and have had them for YEARS.
When I sold LED lighting, out of all that I sold, only four panels came back for warranty work.
Looks like you don't know how to find a quality LED.
"The problem here is recording audio. In the states where this isn't permitted,"
Screw what the states say. The Federal government (specifically the FCC) has this neat little thing about being able to record anything entering YOUR PROPERTY and being able to do what you will with it.
Since that car is my property, I have FULL monitoring rights, audio, video, IR photography, everything.
Most plants will never utilize/see the benefits of the increased CO2 because the temperature was kept consistent. To utilize more CO2, you have to increase the transpiration rate - typically by raising the temperature.
At a controlled temperature, OF COURSE 10,000 umol of CO2 isn't going to help a plant. The rate of transpiration can't match up with the increase in CO2 levels because it's being held at a baseline.
I would like to see this study repeated utilizing various temperatures to find an effective maximum temp/CO2 saturation level.
" You get about 1050W peak at high noon on a cloudless day at the equator and less as you go north or south from there."
Full sunlight on a cloudless, clear day at high noon in the midwestern US is about 2000 umol/m2/s PAR. Specifically, that number was measured in Kansas. That translates out to ~1048W high noon if you ONLY consider the visible range. Add a few more watts for UV and a couple hundred more for IR.
Considering the 2,000 umol standard was ESTABLISHED IN KANSAS, your statement of 'at the equator' is nonsense.
Slashdot Mirror
" Do you know anything about semiconductors (and tubes)?"
I'm probably one of few people on this planet that can run LEDs off raw wall power with zero controlling power circuitry.
I also happen to fabricate my own PN junctions just for fun. Expensive chemicals, though.
That's a surprise to me that there are that many, but not entirely. As we get more solar and wind, HVDC will probably become the choice for transmission, it only makes sense. Market penetration of such, however, is still fairly low.
"For instance, the line drops on a two meter cable run of DC or AC are going to be the same."
You don't know what you're talking about.
http://tinypic.com/player.php?...
See that nice long run of LED on the bottom row near the end of the video, the one with more red output?
That's 24VDC.
Two meters down, meter shows a drop from 24VDC to 18VDC. From there, the LED units began getting very, very fucking hot as resistance in the conductor increases.
https://www.youtube.com/watch?...
See that? I built that. Along with the other building in the video above. From design to electrical, every bit of that is my work.
You have zero fucking clue what you're talking about, sir.
My average wall dimmer is a rheostat, not a thyristor.
And I bet you wonder why you have a lonely life. Because if you can't trust any group or associations of more than one person, you're obviously not going to parties, events, or anything like that.
And I'll bet 20:1 your warehouse was old as shit with un-upgraded power boxes and lines.
200V cap? You want minimum 250V for a 120V line.
"LED is DC, and it needs regulated DC."
Try again.
And again.
Come back when you actually design these things for a living, eh?
The spiral CFL was invented in 1976. In 1980, Philips introduced its model SL. That's right next to 25 years (and jives with the statement 'approaching 25 years old.')
"Because I find it hard to believe in 3 months the extra few dollars/bulb is offset in energy savings."
Welcome to California, where we pay more for power than just about anywhere else in the USA. And it's not even a flat rate per kWh.
Yea, I do that every single day, as I grab the RAW EXPOSED PANEL AND HEAT SINK from off the top of my aquarium. And that's a 100w LED panel.
You're not using SMD high-power LEDs.
I've got 100w LED in a 30mmx30mm package. Guess what? It gets hot enough to fry an egg in about 5 seconds without a heat sink.
DC is only the preferred transport over large distances at HIGH VOLTAGE.
You've already disqualified your own remarks, sir. And I've worked in power generation stations. Almost 100% of America's power grid is AC. The only DC line we have is an HVDC line in California, and even then, it's used to transfer power between unsynched AC systems, and not power homes directly.
"I was looking at LED replacement bulbs at the hardware store the other day ($20 each). I am suspect as to their efficiency. They have large heat sinks on the which get very hot."
Welcome to thermodynamics. LEDs are roughly 40%-ish efficient. That means about 60% of your power is getting dumped as heat.
"There is no way to pack an efficient transformer into such a small space."
I can tell you don't design or wind your own transformers. In fact, you don't need a transformer, all you'd need is a mini variac.
" Houses need wired seperately with a lower voltage appropriate for powering LED lights"
FUCK NO. You're trying to push DC over a distance of greater than two meters. You're going to lose more energy trying to just send the power down the line to the bulb than you will ever save dropping down. Do you even know why we use AC for roughly 95% of the world's power transmission?
"You can install a high efficiency transformer to step down the 120V into a clean, lower voltage signal but that transformer is not going to be cheap"
Please go take an electronics engineering class or two.
"Furthermore, a lot of dimmers are not rheostatic, but instead work by modulating the "pulse width" (for lack of the proper term) of the A/C waveform."
You don't PWM an AC waveform. You PWM a DC output (as it has no waveform, it peaks and stays peaked.)
"an LED light is only likely to work if it has some sort of way to convert the pulse width to relative current level (such as via capacitors)"
No, PWM dimming is caused by a PNP transistor circuit, not a capacitor. Do you even know how a capacitor works? On a DC output side for LEDs, they're almost exclusively used for decoupling. On the AC side, typically used as a power filter/smoother.
"every one that I've purchased - from multiple companies - has burned out prematurely. "
Yea, and I'm willing to bet you cheaped the fuck out on them, plus installed them in areas where you shouldn't have. I've got my entire house lit with LED. I have designed LEDs that run off of RAW AC and require no power controlling circuitry, just a heat sink. And those AC LEDs of mine have already gone almost 8 solid months now without one single problem. I've got hacked and cracked panels out the frame lighting aquariums, growing plants, and much more, and have had them for YEARS.
When I sold LED lighting, out of all that I sold, only four panels came back for warranty work.
Looks like you don't know how to find a quality LED.
"The problem here is recording audio. In the states where this isn't permitted,"
Screw what the states say. The Federal government (specifically the FCC) has this neat little thing about being able to record anything entering YOUR PROPERTY and being able to do what you will with it.
Since that car is my property, I have FULL monitoring rights, audio, video, IR photography, everything.
" you inoculate the soil with mycorrhizae bacteria"
DOES NOT EXIST. Fungus != Bacteria.
"It also makes the crops less nutritionally useful"
Uh, yea, source?
Cuz I do this for a living and I call bullshit.
I have a small problem with your linked study.
Most plants will never utilize/see the benefits of the increased CO2 because the temperature was kept consistent. To utilize more CO2, you have to increase the transpiration rate - typically by raising the temperature.
At a controlled temperature, OF COURSE 10,000 umol of CO2 isn't going to help a plant. The rate of transpiration can't match up with the increase in CO2 levels because it's being held at a baseline.
I would like to see this study repeated utilizing various temperatures to find an effective maximum temp/CO2 saturation level.
" That would basically mean significant reforestation in progress."
How do you think the lumber/paper/tree industry works?
http://forestry.about.com/libr...
Same thing happening over in Europe.
"Banking is protected by law, any lost money will be reimbursed."
Up to $250,000. After that, you're shit out of luck.
Yup, angles almost have nothing to do with it.
As we can tell by this where Antarctica gets more solar radiation in January than any other place on the planet any other time of the year.
The math only looks funny to those that cannot comprehend basic English as they read.
HEAT ENERGY AND SOLAR ENERGY.
Back to 5th grade reading comprehension.
" You get about 1050W peak at high noon on a cloudless day at the equator and less as you go north or south from there."
Full sunlight on a cloudless, clear day at high noon in the midwestern US is about 2000 umol/m2/s PAR. Specifically, that number was measured in Kansas. That translates out to ~1048W high noon if you ONLY consider the visible range. Add a few more watts for UV and a couple hundred more for IR.
Considering the 2,000 umol standard was ESTABLISHED IN KANSAS, your statement of 'at the equator' is nonsense.
Antarctica gets more sunlight in JANUARY than any other place in the world gets in the SUMMER.
Where the fuck are you getting your bullshit information?