I bought a 4 lamp 96 watt compact fixture from Current about 20 months ago.I lost 1 ballast 6months in. Now in the past 3 weeks 2 more have went bad. Is this normal for a 3' long compact flourescent. I've spent $300 on ballasts on a $600 light fixture in a little over a year. I'm just wondering if I should figure $2-300 a year on ballasts,not counting thje price of tubes 45-50 apiece. Any info would be appreciated. Thanks Andy