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#61
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"white" LED's vs. incandescent and halogen lights
Frank Krygowski wrote:
On Dec 9, 6:45 am, smharding wrote: I just swapped out my 2.4/3W halogen B&M headlight for a new LED type that I believe is a mere 1W. The LED is superior in several ways: -- It comes to full brightness at a couple mph. The halogen didn't get fired up until perhaps 5 mph. This is a generator driven light system. -- The light provided is much better for my on road commuting. The lense shapes the light into a nice bright long rectangle in front of me making an excellently lighted focused area in front of me. -- The halogen bulbs burned out fairly soon. I believe the Philips bulb is only good for about 100 hours of burn time. The new LED is alleged to be good for 100,000 hours, so I shouldn't have to replace bulbs in the dark on the road again. So what LED headlight did you get? The Lumotech IQ Cyo R Plus, which is supposed to actually be a little less bright than the similar IQ Cyo Plus. Both have a stand light built in. I've got it matched to a Busch&Müller DToplight XS Plus tail light. It also has a stand light built in and is quite bright. Both lights are driven by a 6V Dymotec bottle generator. A bit pricey for sure, but I now think I've got a near permanent solution to night riding. Feel real good about the purchases despite the cost. Check out the lighting offerings mentioned at Peter White's http://www.peterwhitecycles.com/dymotec.asp SMH |
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#62
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"white" LED's vs. incandescent and halogen lights
On Dec 5, 9:19 am, "Androcles" wrote:
The latest fireflies from Nature now produce more than a million times the amount of light that a compact LED produces for even less electrical power. White LEDs can have an efficiency of 22% currently compared to a maximum possible efficiency for white light of 37%, fireflies are only 96% efficient. -- Ron |
#63
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"white" LED's vs. incandescent and halogen lights
"Ron Peterson" wrote in message ... On Dec 5, 9:19 am, "Androcles" wrote: The latest fireflies from Nature now produce more than a million times the amount of light that a compact LED produces for even less electrical power. White LEDs can have an efficiency of 22% currently compared to a maximum possible efficiency for white light of 37%, fireflies are only 96% efficient. They'd better change their Duracells over to Energizer Bunny cells, then. |
#64
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"white" LED's vs. incandescent and halogen lights
Ron Peterson wrote:
On Dec 5, 9:19 am, "Androcles" wrote: The latest fireflies from Nature now produce more than a million times the amount of light that a compact LED produces for even less electrical power. White LEDs can have an efficiency of 22% currently compared to a maximum possible efficiency for white light of 37%, fireflies are only 96% efficient. Latest record is around 190 lm/W http://en.wikipedia.org/wiki/Luminous_efficacy -- Dirk http://www.transcendence.me.uk/ - Transcendence UK http://www.theconsensus.org/ - A UK political party http://www.blogtalkradio.com/onetribe - Occult Talk Show |
#65
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"white" LED's vs. incandescent and halogen lights
"Dirk Bruere at NeoPax" wrote in message ... Ron Peterson wrote: On Dec 5, 9:19 am, "Androcles" wrote: The latest fireflies from Nature now produce more than a million times the amount of light that a compact LED produces for even less electrical power. White LEDs can have an efficiency of 22% currently compared to a maximum possible efficiency for white light of 37%, fireflies are only 96% efficient. Latest record is around 190 lm/W http://en.wikipedia.org/wiki/Luminous_efficacy -- Dirk How many watts does a firefly use, then? |
#66
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"white" LED's vs. incandescent and halogen lights
Androcles wrote:
"Dirk Bruere at NeoPax" wrote in message ... Ron Peterson wrote: On Dec 5, 9:19 am, "Androcles" wrote: The latest fireflies from Nature now produce more than a million times the amount of light that a compact LED produces for even less electrical power. White LEDs can have an efficiency of 22% currently compared to a maximum possible efficiency for white light of 37%, fireflies are only 96% efficient. Latest record is around 190 lm/W http://en.wikipedia.org/wiki/Luminous_efficacy -- Dirk How many watts does a firefly use, then? No idea, but it is far higher efficiency than any current LED -- Dirk http://www.transcendence.me.uk/ - Transcendence UK http://www.theconsensus.org/ - A UK political party http://www.blogtalkradio.com/onetribe - Occult Talk Show |
#67
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"white" LED's vs. incandescent and halogen lights
"Dirk Bruere at NeoPax" wrote in message ... Androcles wrote: "Dirk Bruere at NeoPax" wrote in message ... Ron Peterson wrote: On Dec 5, 9:19 am, "Androcles" wrote: The latest fireflies from Nature now produce more than a million times the amount of light that a compact LED produces for even less electrical power. White LEDs can have an efficiency of 22% currently compared to a maximum possible efficiency for white light of 37%, fireflies are only 96% efficient. Latest record is around 190 lm/W http://en.wikipedia.org/wiki/Luminous_efficacy -- Dirk How many watts does a firefly use, then? No idea, but it is far higher efficiency than any current LED Yeah, I figured it was much higher than 96% too. Pity you have no idea what "none" is. |
#68
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"white" LED's vs. incandescent and halogen lights
Ron Peterson wrote:
On Dec 5, 9:19 am, "Androcles" wrote: The latest fireflies from Nature now produce more than a million times the amount of light that a compact LED produces for even less electrical power. White LEDs can have an efficiency of 22% currently compared to a maximum possible efficiency for white light of 37%, fireflies are only 96% efficient. -- Ron According to this: http://www.nature.com/nphoton/journa....2007.251.html and this: http://www.bioluminescentbeetles.com/introduction.html New measurements put quantum efficiency of firefly bioluminescence at 41 +/- 7.4%. "Initially predicted to be around 88% efficient the firefly bioluminescent quantum yield has recently been accurately identified to be 41.0 ± 7.4% which is still higher than those found in other forms of bioluminescence, i.e. aequorin (17%), cypridina (28%) and bacteria (30%) [4]." |
#69
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"white" LED's vs. incandescent and halogen lights
On Dec 7, 1:30*am, Peter Clinch wrote:
me wrote: It's obvious that the mundane "white" LED bicycle lights do not light up the asphalt roads very well. *Incandescents, halogens, and sodium lights do better. Oh. *Last week I had the chance to compare a well respected halogen lamp (BuM Lumotec Oval) to a well respected LED lamp (BuM IQ Fly) on the same (unlit, asphalt) road at the same time, both running from dynoubs on side by side bikes, and the IQ Fly did a damn site better job of lighting it up. So obvious to some, perhaps, but not me. Pete. -- ok, So it looks like I'll have to to some unbiased testing. It will take a while. Lifestyle hardships get in the way. Just a homeless bum, you know. There are issues involving 1. Spectral distribution from the emitting sources of light 2. Spectral reflectance from whatever the light hits 3. Reflective intensity of the individual colors 4. Spectral perception of the individual 5. Calibration of the reflected colors from a camera device and the display device 6. Mathematical dealings with superposition issues I have the 'digital color utility' on my aging mac and an older digital camcorder that I use for stills. I don't have a high quality LED lamp which costs too much for me to buy so maybe I'll be able to borrow one to test. I have an ancient 35mm camera with a light meter that I will have to calibrate and buy a battery for. I'll have to buy a few LED's and potentiometers from a parts store. I'll try to mount them on a dissected cateye opticube. I'll use my cheap digital voltmeter to get the relation between power and illumination. I have a diffraction grating that might reveal something. I'll mount it on a toilet paper roll with a slit on the other end, and attach it to the camera. I'll use my set of oil crayons for color reference that I previously used to make a panhandling sign. I figure I'll eventually shoot around 50 still pix. I might add a set of fluorescent light pix. I suppose I'll web it up eventually. errata - 1. many asphalt streets I've seen have varying amounts of small exposed stones (limestone?) embedded on the surface that will reflect yellows better than blues. Trees and foliage have a lot of yellow reflectance. 2. Older people may experience yellowing of the lens in their eyes, causing less sensitivity to blues. Recently I recommended a 2 front- light setup for a 60-something biker - one small blue-light flasher, and a larger halogen with adjustable focus mounted on a flashlight holder. If you use the halogen only occasionally, the batteries should last a long time |
#70
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"white" LED's vs. incandescent and halogen lights
On 11 Dec, 16:24, me wrote:
On Dec 7, 1:30*am, Peter Clinch wrote: me wrote: It's obvious that the mundane "white" LED bicycle lights do not light up the asphalt roads very well. *Incandescents, halogens, and sodium lights do better. Oh. *Last week I had the chance to compare a well respected halogen lamp (BuM Lumotec Oval) to a well respected LED lamp (BuM IQ Fly) on the same (unlit, asphalt) road at the same time, both running from dynoubs on side by side bikes, and the IQ Fly did a damn site better job of lighting it up. So obvious to some, perhaps, but not me. Pete. -- ok, So it looks like I'll have to to some unbiased testing. *It will take a while. *Lifestyle hardships get in the way. *Just a homeless bum, you know. There are issues involving 1. *Spectral distribution from the emitting sources of light 2. *Spectral reflectance from whatever the light hits 3. *Reflective intensity of the individual colors 4. *Spectral perception of the individual 5. *Calibration of the reflected colors from a camera device and the display device 6. *Mathematical dealings with superposition issues I have the 'digital color utility' on my aging mac and an older digital camcorder that I use for stills. *I don't have a high quality LED lamp which costs too much for me to buy so maybe I'll be able to borrow one to test. *I have an ancient 35mm camera with a light meter that I will have to calibrate and buy a battery for. *I'll have to buy a few LED's and potentiometers from a parts store. *I'll try to mount them on a dissected cateye opticube. *I'll use my cheap digital voltmeter to get the relation between power and illumination. *I have a diffraction grating that might reveal something. *I'll mount it on a toilet paper roll with a slit on the other end, and attach it to the camera. *I'll use my set of oil crayons for color reference that I previously used to make a panhandling sign. I figure I'll eventually shoot around 50 still pix. *I might add a set of fluorescent light pix. *I suppose I'll web it up eventually. errata - 1. *many asphalt streets I've seen have varying amounts of small exposed stones (limestone?) embedded on the surface that will reflect yellows better than blues. *Trees and foliage have a lot of yellow reflectance. 2. *Older people may experience yellowing of the lens in their eyes, causing less sensitivity to blues. *Recently I recommended a 2 front- light setup for a 60-something biker - one small blue-light flasher, and a larger halogen with adjustable focus mounted on a flashlight holder. *If you use the halogen only occasionally, the batteries should last a long time You'll also want a reference grey card (shirt card) and a tape measure.. |
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