Quote:
|
Originally Posted by mexiken
Sledge,
I found something wrong with this website. In fact, its in one of the first sentences in the paragraph about blue bulbs.
"White light is made up of every color of light mixed together."
WRONG. White the color, is the absence of pigment. Webster says "white" is "free from color". BLACK is every color mixed together. We did an expirement in oh, 3rd grade or so that proved that. If you put some dye on a strip of black paint, you get all sorts of colors on that strip.
I made a mistake in saying that color and brightness go hand in hand. What I meant to say was that color temp in Kelvin and the amount of "blueness" go hand in hand. As the color temp goes up, light (NOT BULBS, strictly light) appears more and more blue. A blue tinted bulb however, screens out everything BUT blue, which wouldn't make it any brighter than a non tinted one. Lumens is the correct way to measure brightness correct ????
|
Actually both of your statements about color are right, but they're not interchangeable. White light IS the combination of all colors of light. And as far as pigment goes, black (actually the truly correct color is brown) is the combination of all pigments, generally speaking. These statements are both correct, one refers to additive color and the other to subtractive.
The color "temperature" refers to the combination of wavelengths of light produced. White light is the combination of all wavelengths (and full spectrum light includes all the non visible light too, including what we normally think of as radio waves, all are light) but not all lamps produce the same spectral components at the same intensity. The higher the frequency the "bluer" the light appears because it contains more of the higher frequencies of visible light (closer to the blue end of the rainbow). Using a blue colored bulb actually does just filter out some of the other frequencies, in essence reducing the total light emitted, actually making it less intense in total light output, even if it seems brighter because of the color. Lamps that produce bluer light may actually output higher intensity in that spectral band than other bulbs and thus produce more light of that color for the same energy consumption, so measuring them as "brighter" can sometimes be deceptive. there's no more total energy emitted compared to an equivalent wattage bulb, but they may produce more energy at a particular frequency range than the others because they're not "wasting" as much energy producing lower frequencies.