If price is not a huge concern, then the heat issue would be the biggest difference you'll notice between a tar and electronic. Secondary, would be noise. Tar ballasts have a hum, whereas electronic ballasts are dead silient. Thirdly, I think the electronic ballasts are a bit more stable and less prone to 'off cycles'. I'm running 400 watt tars myself and haven't had any problems with it shutting off though.
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George
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