somya1 Posted March 3, 2009 Report Share Posted March 3, 2009 When we work for long hours under a CFL Lamp, it weakens our eyes and affects our health. It contains toxic substances like mercury which can lead to cancer. Guess its time for us to replace CFL bulbs forLEDs Quote Link to comment Share on other sites More sharing options...
freeztar Posted March 3, 2009 Report Share Posted March 3, 2009 When we work for long hours under a CFL Lamp, it weakens our eyes and affects our health. Please support these claims! Quote Link to comment Share on other sites More sharing options...
GAHD Posted March 4, 2009 Report Share Posted March 4, 2009 Light Emitting Diodes generally only produce a very narrow spectrum of light. If they made a large array of multiple types, maby, but right now the gas mixture used produces a much wider spectrum, which is 'easyer' on the eyes IMO. Quote Link to comment Share on other sites More sharing options...
freeztar Posted March 5, 2009 Report Share Posted March 5, 2009 Light Emitting Diodes generally only produce a very narrow spectrum of light. If they made a large array of multiple types, maby, but right now the gas mixture used produces a much wider spectrum, which is 'easyer' on the eyes IMO. Ditto on my last post. Quote Link to comment Share on other sites More sharing options...
Roadam Posted March 5, 2009 Report Share Posted March 5, 2009 No matter what the spectrum of the light, if the object is red it emits red wavelenght if its green it emits in green. Although diffrent collors might look diffrent under diffrent types of light. The problem is either overillumination or light flicker. Thats the problem with CFLs, they emit some UV light and the old ones flicker at 100Hz. But newer and more efficient use electronic ballasts which have a frequency of about 20kHz, so flicker cannot be sensed with ordinary methods. I would love to see more LEDs, couse I have a flashlight that has one and its bright as the sun. :) But CFLs are just as good for the time being. Quote Link to comment Share on other sites More sharing options...
jab2 Posted March 6, 2009 Report Share Posted March 6, 2009 No matter what the spectrum of the light, if the object is red it emits red wavelenght if its green it emits in green. Although diffrent collors might look diffrent under diffrent types of light. Sorry, Bud, I think you should research color a bit. Specially the color of objects. Quote Link to comment Share on other sites More sharing options...
HydrogenBond Posted March 6, 2009 Report Share Posted March 6, 2009 The LED lights are still quite expensive but have many advantages. They have an extremely long life in the range of 50-100K hours, and give off the most light energy for any given amount of energy input. They run cool, but do require a heat sink. LED's can be tailored to specific wavelengths or can be made in white. The current trend is to make larger lights using many small LED bulbs, each in the range of 0.25-2 watts, with the higher end more efficient but more expensive. So if you need 20 watts, an LED light might be be composed of 80-10 light emitting diodes. The better lights also uses little lens on each diode, to focus the angle of the light for spot or diffuse effects. One possible future application, which is already in use, is home stage lighting effects, where an area is lighted with separate R,G, and B, to create vivid colors. Turning the dinner party into a colorful theater affect would be the lighting equivalent of surround sound, which can be adjusted for ambience. Quote Link to comment Share on other sites More sharing options...
Michaelangelica Posted August 30, 2009 Report Share Posted August 30, 2009 When we work for long hours under a CFL Lamp, it weakens our eyes and affects our health. It contains toxic substances like mercury which can lead to cancer. Guess its time for us to replace CFL bulbs forLEDsI have years to wait for the CFLs that I put in this year to explode.But yes, LEDs are the future. They will enable us to turn our sterile, concrete cave/malls into tropical forests and re-connect our office workers with nature as we fill these spaces with the trillion plants we need there. The the eye-piercing brightness is a problem for some and more mellow light needs to be developed. Quote Link to comment Share on other sites More sharing options...
Michaelangelica Posted August 30, 2009 Report Share Posted August 30, 2009 Sorry, Bud, I think you should research color a bit. Specially the color of objects.I don't understand.Do you mean 'reflect' is the word to use, not 'emit"?:phones: Quote Link to comment Share on other sites More sharing options...
jab2 Posted August 30, 2009 Report Share Posted August 30, 2009 I don't understand.Do you mean 'reflect' is the word to use, not 'emit"?;)Yes. Quote Link to comment Share on other sites More sharing options...
RWeb Posted October 5, 2009 Report Share Posted October 5, 2009 So the question is are LED's a good idea? guys, try Googling LED Lightbulbs....eg. a 7.5W LED Lightbulb is the equvalent of a 60W Incandescent, and they last 40x the life of a incandescent. Cost? WELLL that's something of a different topic (they are more expensive)... HOWEVER....would LED lightbulbs be easier on the eyes? Well I dont know since I dont have any, but my guess is that they would be. ----------------------- Quote Link to comment Share on other sites More sharing options...
Moontanman Posted October 6, 2009 Report Share Posted October 6, 2009 So far my experience with LEDs has been somewhat less than ideal. The spectrum is far to narrow, the bulbs they sell are not as bright as advertised and the things are outrageously expensive. Quote Link to comment Share on other sites More sharing options...
stereologist Posted October 6, 2009 Report Share Posted October 6, 2009 I would have to agree with Moontanman. I even have an LED headlamp for camping. The light takes a bit getting used to. The illumination is not what I would expect. I am wondering if the narrow visible light band leads to seeing difficulties, or if the rated output includes invisible parts of the spectrum or nearly invisible parts of the spectrum such as long reds near the infrared end of the visible spectrum. Quote Link to comment Share on other sites More sharing options...
freeztar Posted October 7, 2009 Report Share Posted October 7, 2009 They are quite a bit more expensive than incandescents or CFL, but they are coming down in price. This company claims to have developed a LED array that delivers full spectrum light, or any K rating desired (within limits). Full Spectrum LED Grow Light LEDs seem to be a great idea in the long run, but I agree that they are currently too expensive, despite their longevity. Quote Link to comment Share on other sites More sharing options...
Boerseun Posted October 7, 2009 Report Share Posted October 7, 2009 What's the pollution footprint of the LED production process? It doesn't help that they use a lot less energy than normal bulbs, last ten times as long, but produces ten times the pollution in production. So - anybody know? Quote Link to comment Share on other sites More sharing options...
Michaelangelica Posted October 8, 2009 Report Share Posted October 8, 2009 LEDs seem to be a great idea in the long run, but I agree that they are currently too expensive, despite their longevity.There was an interesting discussion of these in a Poll thread "How many Indoor Plants do Hypographer's Grow" or similar. I can't find it so may have the name wrongThere is a good link to a Chinese manufacturer of LEDs in a post by HB. You could go to the electrical shop, buy a stack of different spectrum leds, and knock a light up yourself? Quote Link to comment Share on other sites More sharing options...
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