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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
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Do you think LEDs are a good idea?
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#2
freeztar 
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Posted 03 March 2009 - 03:58 AM
somya1 said:
When we work for long hours under a CFL Lamp, it weakens our eyes and affects our health.
Please support these claims!
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"There are no passengers on Spaceship Earth. We are all crew." - Marshall McLuhan
"We must not forget that when radium was discovered no one knew that it would prove useful in hospitals. The work was one of pure science. And this is a proof that scientific work must not be considered from the point of view of the direct usefulness of it." - Marie Curie
#3
GAHD
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Posted 04 March 2009 - 09:24 AM
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.
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.
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#4
freeztar
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Posted 04 March 2009 - 03:29 PM
GAHD said:
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.
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.
Hypography Science Forums Moderator
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"There are no passengers on Spaceship Earth. We are all crew." - Marshall McLuhan
"We must not forget that when radium was discovered no one knew that it would prove useful in hospitals. The work was one of pure science. And this is a proof that scientific work must not be considered from the point of view of the direct usefulness of it." - Marie Curie
---
"There are no passengers on Spaceship Earth. We are all crew." - Marshall McLuhan
"We must not forget that when radium was discovered no one knew that it would prove useful in hospitals. The work was one of pure science. And this is a proof that scientific work must not be considered from the point of view of the direct usefulness of it." - Marie Curie
#5
Roadam
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Posted 05 March 2009 - 12:50 AM
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.
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.
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#6
jab2
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Posted 06 March 2009 - 01:54 AM
Roadam said:
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.
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#7
HydrogenBond
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Posted 06 March 2009 - 06:34 AM
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.
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.
#8
Michaelangelica
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Posted 29 August 2009 - 04:04 PM
somya1 said:
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
I 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.
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#9
Michaelangelica
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Posted 29 August 2009 - 04:09 PM
jab2 said:
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"?
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#10
jab2
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Posted 30 August 2009 - 08:01 AM
Michaelangelica said:
I don't understand.
Do you mean 'reflect' is the word to use, not 'emit"?
Do you mean 'reflect' is the word to use, not 'emit"?
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Cobus
"It is impossible for a man to learn what he thinks he already knows." - Epictetus
"The eye sees only what the mind is prepared to comprehend." - Henri Bergson
"Don't argue with an idiot; people watching may not be able to tell the difference" - Unknown
Cobus
"It is impossible for a man to learn what he thinks he already knows." - Epictetus
"The eye sees only what the mind is prepared to comprehend." - Henri Bergson
"Don't argue with an idiot; people watching may not be able to tell the difference" - Unknown
#11
RWeb
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Posted 05 October 2009 - 12:08 AM
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.
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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.
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#12
Moontanman
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Posted 05 October 2009 - 04:49 PM
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.
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Life is the poetry of the universe.
Love is the poetry of life.
You do not possess belief... Belief possesses you...
Nuclear is the only real option!
http://www.nuclearsp...hip_menupg.html
Over heard from a three year old, "Daddy why do my toes get sticky when I eat strawberry jam?" :shrug:
Never wrestle a troll. You both get dirty and the troll likes it :doh:
Feel free to visit my You-Tube Channel here.
#13
stereologist
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Posted 06 October 2009 - 09:06 AM
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.
#14
freeztar
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Posted 06 October 2009 - 07:07 PM
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.
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.
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"There are no passengers on Spaceship Earth. We are all crew." - Marshall McLuhan
"We must not forget that when radium was discovered no one knew that it would prove useful in hospitals. The work was one of pure science. And this is a proof that scientific work must not be considered from the point of view of the direct usefulness of it." - Marie Curie
---
"There are no passengers on Spaceship Earth. We are all crew." - Marshall McLuhan
"We must not forget that when radium was discovered no one knew that it would prove useful in hospitals. The work was one of pure science. And this is a proof that scientific work must not be considered from the point of view of the direct usefulness of it." - Marie Curie
#15
Boerseun
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Posted 06 October 2009 - 08:20 PM
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?
So - anybody know?
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