lights and color temp.

[StirCrazy]

Originally Posted by whaase

I've been wondering this for awhile and now I'll ask I'm not understanding how a flourescent bulb that is 6500k is fairly blue. Yet a 10k MH bulb in ice white. Or actinic bulbs are 7100k and a 10k is white. Anyone care to teach me?

Walter

ok a 6500 tube is not blue in anyways it is yellowish white (more to the white side)

the 7100 blue bulbs you were talking about were 7100 color rated bulbs with blue phosphers to make the light look blue, but there is no actinic light to them.

10K is white.

these are all based of the ansi standerd that compars them to the color a black body will radiate when it is heated to a specific temp. so the 6500K is actual a tempature that relates to a color, but only if the company follows the ansi standard. Sylvainia just brought out a "daylight compact floressent" that has a actual color temp of 3200K.

so for a referance the afternoon sun at the equator is 6500K so that means it emits the same overall color as a black body heated up to 6500Kelvin if you go higher there is more of a blue componant added to the light so it appears whiter and then after a certian point it starts taking on a blue hue, then vilote (sorry Bob no such thing a purple light )

so a 10K bulb should be realy white and a 15K bulb should be white with a touch of blue, 20K should be a nice blue and so on.

here is a neet link to help understand
http://cs.clark.edu/~mac/physlets/Bl.../blackbody.htm

Steve