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I think it is down to their bulbs. It looks like most MH bulbs over here are a standard envelope. At least that's all this supplier has and I think that is why they are saying I can't use it and don't want to refer me to a supplier that sells the tubular MH bulbs. So if I get hold of a tubular...

No it doesn't have a built in ballast. I believe it is just a reflector that can handle a range up to 1000W. This is the reply I had from the seller: "The reflector can run a retro MH lamp only but the normal MH lamp; however, the retro MH lamp cannot run with the MH ballast. We suggest you to...

Thanks for the feedback. I contacted the supplier to ask too. Turns out, the particular reflector box (Growlush Coolsun 1000W) I was looking at can handle a retro-fit MH but you need to run it with an HPS ballast, making my MH ballasts and standard MH bulb redundant. So I'll just get an open...

Hi all, I am hoping you can help me out. I have been reading this forum the last few months and slowly building my setup. I have seedlings going under a CFL which is fine for now but I will switch to a 250W or 400W MH soon. I got hold of a set 250W and a 400W MH ballasts second hand. I need to...