That's very odd. I don't know if it could be bulb or ballast but I have some old 150W DE's you could borrow, if you wanted, to see if they fire. If they don't fire up OK you know it's ballast, or maybe wiring connectors or loose sockets; if they do fire up OK then you just need a new bulb.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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