Q & A

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Potbound, the biggest difference between ballasts is that the old ones use copper coils that generate a whole bunch of noise and heat. They're also heavy. The new digital ballasts use electronic circuitry (no moving parts) that's much quieter, cooler and lighter.

Also, most digital ballasts will burn both HPS and MH bulbs, have faster start up times, and improve lamp life. I switched over to digitals about a year ago and haven't looked back.