You can go down in wattage, but not up.

I have a 1,000w HPS light and a 1,000w digital ballast combo. My ballast is interchangable though, so I run it at 600 watts on a 1,000w bulb with no problems at all. Going down in wattage some say prolongs the overall life of the bulb. Going up does just the opposite.
GROWxMOREx420 Reviewed by GROWxMOREx420 on . 600 watt light of 1000 watt ballast possible? what im trying to ask is can you take a 1000watt Electrical ballast, and run lower wattage lights of it e.g. 600,400? im guessing no! anyway thx in advance:thumbsup: Rating: 5