Here is some info I am posting from Discount Hydro on their digi ballasts.


Compact, quiet, and lightweight, Electronic Digital Ballasts operate using electronic circuitry instead of a magnetic ballast. They offer a number of advantages over standard magnetic ballasts. The power factor is 99%, which means that they are very efficient. The 1000 watt ballasts run at 120 volts. The 400 watt and 600 watt run at either 120 or 240 volts by just changing the power cord. They are very quiet during operation. A power savings of about 10-15% makes these ballasts very economical to run. They can run either Metal Halide or High Pressure Sodium Bulbs. Soft starts will increase the life of your bulbs.

Hope this helps you make your decision. I went with digi as I figure they will easily pay for themselves.


b0nger