I have only grown with cool whites. And from everything I have read it is the preferred method. You can grow with warms if you want to though. Its kind of like you can grow veg under a HPS just fine but it is recommended you use a Metal Halide. Or you can grow awesome buds under a metal halide but an HPS is preferred because the red spectrum of light is better for flowering. Also, an HPS 400 Watt will put out more lumens than a MH 400 Watt.
IthoughtIknewitall Reviewed by IthoughtIknewitall on . Fluro question. Hi people, I decided to go with fluro's for the veg stage of my next grow to cut a few costs (electric bill) and also so I can make a seperate flowering room with my hps in it. I have bought 4 4 foot fluros at 40 watts each. The bulbs that came with them just said white on the boxes. I know I need warm and cool white but is there any way to tell which I have ie colour as I know some are pinkish and others are blueish. Cheers :D Rating: 5