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i know a guy who is selling some used 400w hps ballasts with reflectors and bulbs for $25 each but they are wired for 347v. ive seen a few different kinds of ballasts and all were capable of 120, 240, and 347v. this guy doesnt know if they can be changed to 120 and i really dont want t take...

im just wondering what the proper method is for finding out the sex of plants as early as possible. i was also wondering if its possible to test if HPS bulbs are still good WITHOUT a ballast. tenants left them at a friends property and was going to sell them. they look to be in good condition...