Most standard hps bulbs only give out more to the red side of the spectrum which the plants craving for during thier flowering stage, have you got a multi purpose hps bulb? if not then stick with the flourocent bulbs for veg for the mean time. only light i got is a 400watt hps like yourself bulb i got the multi purpose bulb but they seems to react more to natural sunlight...i lil confused myself

Heres a pic of the package my multi-purpose bulb came in...hope this helps!
Ze w33d Farm3r Reviewed by Ze w33d Farm3r on . IS A HPS 400W, GOOD FOR VEG.? I was wondering if my 400 w hps bulb is good for my plants during the veg.??? or would it not be the best to use? i have 4 footer flourocent lights,that i think i am going to use for veg......let me know what u think.thanx Rating: 5