What bulbs are you wanting to get ballasts for? HQI ballasts are magnetic by design, and to my knowledge there are no true HQI 400W ballasts. Lots of people like electronic ballasts for their efficiency and size, and the fact that they'll fire lots of different bulbs. In 250W, though, the HQI ballast (M80, I think) will fire the DE bulbs almost 20% brighter. It does use more electricity.



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