Get a 600w solis tek ballast if $160 isnt outta your price range, 160 delivered from nehydro. Set it on 400 and run a 400w bulb. If you wanna run 600w just set ballast to 600 and slap a 600w bulb in. I'll run nothing but solis tek ballasts and ushio bulbs since my first purchase, truly love um both.