color temp of cool green maybe 5700k.

@nineaclock so anything above 4000k gives you a headache?

Anything above 5000K sometimes does. I prefer very warm colors. Sodium lamps or Incandescents. 

2K is also great!

high pressure sodium is ok.the median color of hps is 2000k it can be as low as 1900k or as high as 2100k.depending on the mfg.

Ya I like 1900K but Sylvania sales nice HPS lamps that have a Golden Crisp color. My 250 HPS flood puts out that color range. I used to have a White Son in the fixture but it never worked out. The rest of the house is Incandescent bulbs and some 2700K CFL.

4100K and colored tubes!

For me it depends on the use, and the fixture, but I have definitely noticed I gravitate toward higher color temperatures. Almost all of my linear fluorescents are 4100K, as that is the "classic" color for them that I grew up with, so I think that's my favorite color. I also prefer that for metal halide lamps.

For working, I definitely prefer 4100K. For working in the early morning when I'm still sleepy, 5000K or higher helps more than caffeine. For relaxation/casual lighting, I prefer 2700K CFL to incandescent (more of a purplish/greenish hue due to the mercury lines I guess). HPS is also good. For late night partying, my favorites are clear mercury & black light.

I dislike the 3500K fluorescents in my office, and prefer just the window with sunshine wherever possible.

i also tend to gravitate towards higher color tempatures with 4100 and 6500 k bring my favorites,i also dont mind something as high as 10 or 20 k.

I like 4100 to 6500 for fluorescent indoor task lighting,I don't mind what temperature colour is used for outside lighting.

I like 4100 to 6500 for fluorescent indoor task lighting,I don't mind what temperature colour is used for outside lighting.

i prefer mercury vapor and metal halide(ceramic of course)to be used outside,i tried to use high pressure sodium,it was aright but it started murdering my trees and grass,so i switched back to mv.

i think good tempatures for the outdoors would be.
2700-3100k

3900-4100k

6500k

and what would be really intresting,would be to see a street lith with 10-20 k metal halide lamps!

4100 K is my favorite for task lighting.

6500 K is too bluish, 3500K & 3000K make things look yellow & dull!
My entire house is lit with 4100K CFLs and linear fluorescents!

i read an article about cfls and it says that you should buy cfls with color tempatures that compliment the colors of the room.

the first cfl i bought was a two pack of general electric 6500k 10 watt cfls,,since it was my first time being exposed to the color,it took me three weeks to get used to the blue color,because i was used to incandescent bulbs.

It definitely is an adjustment to get used to the far reaches of the color spectrum, when you are accustomed to either one end or the other.  For example, I used to have 3000K CFLs in my room, but thought that they made everything look yellow and dull, so I switched to 6500K.  As a result, I experienced the same thing--it took time for me to get used to the new color temperature.  However, now when I am in a room lit with 3000K or 3500K lamps, it bothers my eyes, because I'm used to bright, bluish-white light!

Regarding LPS lighting--it is my second favorite HID lighting source, the first being MV!!!  I especially love that beautiful red neon glow when it first starts up!

i like all hid lamps with mercury vapor being my favorite.