I've seen some cheap 150w 20,000K double ended MH bulbs on ebay from Hong Kong. Has anyone tried these are the any good or just rubbish? they were listed as £5 or approx $10.
I tried some when I had my HQI lights. They were great for about a month and then started dimming rapidly and shifting color. I'm afraid this is another case of "you get what you pay for".