Why would you need a 250 watt ballist for t5 lights ? 250 watt is for metal halide bulbs not t5. I saw your other post neither make sence. If your t5 are broken then you need a t5 ballast. In that case how many bulbs and what are the length? Also have you checked to see if a t5 bulb has just come loose or something doubt dropping a fixture would break the ballast inside.
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