Guest snapper March 15, 2003 March 15, 2003 tough one. Maybe you can ask the manufacturer. Do so with a jaded eye though. They may say "of course" just to sell you $200 worth of bulbs.....
Coral Hind March 15, 2003 March 15, 2003 Depends on what wattage you have. 400w Radium 20KK were made for euro reactor ballast. Closest thing in the US is the pulse start ballast(ANSI M135). If you are talking about the 250W Radium then the ANSI M80 which is an HQI ballast and also has a starter is recommended. Probe start ballasts can be used but you might see a flicker or have problems starting due to the lower starting voltage. If you haven't bought the ballasts yet check into the electronic ones. I think most will fire both kinds.
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