Allright...seems that I cannot get away with it then. Being pulled between two options now, increasing the space of my cabinet or buying a complete 400W HPS lamp. Think I will go with the first one since I've already used double the budget for this room compared to what I estimated towards my girlfriend

Also, its ofcourse always better to use the 600W HPS instead of 400.


Thanks for the answer
HeartCore Reviewed by HeartCore on . Ballast question Hi all I got a 400W MH lamp with a ballast. Also have a 600W HPS for flowering, also with a ballast. Problem is, I'm vegging with the 400W but the weather is just too hot. I can manage temps with difficulty. If the weather doesnt change soon, I will have major problems with flowering once I switch to 600HPS. What I want to do is to get a 400W HPS bulb for flowering, I'll use the 600W exclusively in winter. Question is, can a 400W HPS bulb be safely connected to the ballast of a 400W Rating: 5