fredknack Posted January 13, 2012 Share Posted January 13, 2012 Hi I have a dual 250 HQI fixture and it started making a crazy loud hum. The bulbs are ancient. Is there any chance that the old bulbs are the problem? I would hate to buy new 250 HQI bulbs just to discover that my ballast is hosed. Link to comment Share on other sites More sharing options...
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