Quote:
Originally Posted by Robw
Sounds like they are electronic ballasts. Electronic ballasts are suppose to fire all bulbs. I believe HQI bulbs are over driven by the ballast by design. I once tried a regular DE bulb on a HQI ballast and it ended when the bulb exploded after about 15 minutes. 
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That is where I still get confused. Some articles state that all 250 DE bulbs are HQI and run best on magnetic ballasts. One article said Radiums should only be run on magnetics.
Maybe because they "overclock" the bulbs...