A. Don't use a filter on any light, any time...:stoned:

B. Metal Halide bulbs come in different Kelvin temperatures. 3000k, 4000k, 5000k, 6500k, 7200k.
3000k-4000k (warm white) works well for flowering. 6500k-7200k (cool white) works well for vegging. Just swap bulbs...

HPS bulbs are mostly 2000k-2400k. They have more lumens; which can help with some sativa strains.

A 400 MH bulb can handle 3-5 flowering female plants, very well.
Dutch Pimp Reviewed by Dutch Pimp on . DAMN CATS!!! This morning I discovered all of the sucker leaves gone from my shortest bushy plant, and all of the sucker leaves stripped from one side of another plant. :wtf: Now, where i had a plant, I have this stick with secondary small but active growth on the sides and a couple of leaves at the top at the top - sorta resembling a 6 inch palm tree, and a mildly damaged but surely stunted bigger sister. Well.... That and four cats looking around with that , "Huh? Whad'daya talking about? Is it Rating: 5