Troy I used 175w 10ks from J&L for a good 14-15 months. I ran one on a standard pfo ballast and the other on a hamilton ballast (I don't knwo what the actual ballast was inside). The pfo was maybe a little bit brighter. I would be curious to know what other ballasts might utilise the 175 bulbs better. I haven't seen 175w hqi ballasts, but I wonder how they might run on a 150w hqi ballast. I'm curious to see what kind of information you find. I still have my 3 month old 175s sitting on the shelf.
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