Why green/turquoise over white?

BOK

BOK

Joined
Apr 16, 2002
Messages
2,413
Besides been brighter are there any other advantages the turquoise light has over the white?
 
Might want to try asking on CPF, but I think it's because turquoise/green light can appear brighter with less actual power output. So you save your night vision, to some extent, while you think that the light is bright.

I probably mangled that up, if I even remember correctly. Again, try checking CPF.
 
Depends upon the application. But, "green" light is cleaner than "white" light. This is accomplished by the way the light is filtered.
 
Red is what was commonly used for map reading however green has been found (if regulated well) to have almost 0 effect on your night vision. Making green the optimal light to be used in map reading.
 
Most of the green leds put out more actual light than the whites do at the same current levels. Fro example, I had some led cluster bulbs made and at 6 volts 45 ma draw the whites put out 6400mcd and the greens put out roughly 11,000mcd!

To my eyes the green is also much more distinct, and causes less glare in low light setting than the white, while being in most cases far brighter with better throw and color rendition than red.
 
I have a turquoise and a white ARC AAA. I use the white 98% of the time and wonder why I bought the turquoise. The only time I use my turquoise is when I am reading late at night and don't want to keep others awake.
 
I got this off of

http://misty.com/people/don//lede.html

It explains how different colors are percieved at night.

There is photopic vision and there is scotopic vision. Photopic vision is "day vision", which sees detail and color and works better in brighter light. Scotopic vision is "night vision" which is low resolution and
black-and-white. In dimmer environments, there is "mesopic vision" where both scotopic and photopic vision are functioning.

As it turns out, photometric units such as the lumen, lux, footcandle and the candela are defined in terms of photopic vision. Two light sources with different spectral content and having equal photometric
measurement will appear equally bright to a "standard human eyeball" that is in photopic mode. But in scotopic mode, human vision has reduced sensitivity to red wavelengths and increased sensitivity to
wavelengths from mid-blue to mid-green. Two light sources with equal photometric measurements can have very unequal performance to a dark-adapted eye if their spectral content is different.

Most high brightness green and blue LEDs and all of the usual high-brightness blue-green LEDs have a spectrum that is greatly more scotopic-vision-favorable than the spectrum of incandescent lamps,
especially lower wattage / lower current, longer life incandescent lamps. A nightlight made with non-yellowish-green, blue-green or turquoise blue LEDs will appear to illuminate a room more brightly than
an incandescent or neon nightlight with equal lumen output.


Ryan
 
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