The home depot here carries 400 watt HPS bulbs. They just don't have the ballast's. Call them up and ask them and if they don't I bet a HD somewhere near you does. I just went to HD's website and searched for 400 watt sodium and the bulb came up. $45.96 a piece.

My rule is to match the bulb with the ballast. No exceptions. (unless it's a conversion bulb)

Laterz
Sativagrowin Reviewed by Sativagrowin on . bulb not working! ok so my bulb is not working. i have a 400watt hps ballast. can i go buy a 150watt hps from HD and use that with my 400 watt ballast until my new bulb arrives? answer please ASAP before the stores all close :( :( :( Rating: 5