HEY blue...

: )
A 600watt HPS on it own... will be better than any 400watt conversion bulb...

But it will generate a bit more heat..

Just thought I'd throw that out for you as an option..
Garden Knowm Reviewed by Garden Knowm on . Another Lighting Question??? if im gonna purchase a 400w mh grow light system and use the mh for veg would a 360w hps conversion bulb to use during flowering be enough to flower 4 or 5 plants??? Rating: 5