the "standard" 250 watt ballast relies on the starter in the bulb, this is a probe start set up. the only bulb that doesent have a probe starter built in that I know of for sure right now is the 250 watt radium. so your ballast will start almost all 250 watt bulbs.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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