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Philips 330w Ceramic Metal Halide retrofit for 400w MH ballasts
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Finally found one for just $25 on the bay and this INCLUDES FREE SHIPPING! These are expensive lamps, so this is a steal. What's unique about the Philips CMH Energy Advantage line is that they have AllStart technology allowing them to fire up on standard probe start ballasts without ignitors. I don't know how it works, there is no ignitor inside that I can find. Hope someone knows!
I found it will not easily start on a mercury vapor ballast, but I got it going with the help of a BBQ ignitor. It is very bright and has a pleasant color rendering. USA made too!
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I would like a retrofit Metal Halide lamp for my HPS fixtures.. That would be nice I bet ebay has them!