Cool Vs. Warm Fluorescents

[llamaman666]

Ive never heard of "soft" florescents.
whats the spectrum (kelvin temperature)

[jadeius]

I believe cool-whites have more light at the blue/violet end of the spectrum, where warm-whites are more on the red side. Marijuana plants tend to like that blue part of the spectrum. To understand the difference in the two different shades of white the lights will produce, try looking at a white wall through one eye, and then the other. As you repeat this, one eye will see a slightly more reddish-tinted white, or "warm" white, and the other eye will see a slightly more bluish-tinted white, or "cool" white. The sun has a lot of UV light, which is beyond the blue/violet end of the spectrum. Plants flourish best in the direct sun, which means they like the closest thing to UV light they can get, which is cool white light with more blue and violet wavelengths. Someone said that the warm white flourescents were better for the flowering stage, but I wouldn't know about that, I'll try it some time.