I'm currently running the Iwasaki 15k and just switched to a Vertex 175w e-ballast from a PFO pulse start tar ballast. I don't have a par meter but the Iwasaki bulb is significantly brighter with the e-ballast over the tar. Having said that, if you're comparing par output between a 175w Iwasaki mogul and 150 hqi bulb, you'd have to factor in the ballast choice as well.
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-Mason
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