I can't explain it but I know that electronic is more efficient. The electronic is cooler and is gentler on your bulbs, IE you're bulbs last longer with electronic. Tar ballasts are heavy and generate alot of heat which to me means wasted energy. The last thing I know is that some bulbs are pulse start meaning they need a Hight voltages pulse of electricity to kind of jump start them where as some are probe start (those bulbs have the stuff built in to do the pulse). If you go electronic you can use any bulb as long as it's rated the same wattage.
Doug
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