I have 2 72" Hamilton 3 175w and 2 60" VHO. Up until recently I was using Ushio 10K 175W and I continually had problems with firing many time I would come home only to find that 2 of the 3 have fired. I discussed the problem with the boy at J&L and Jeff told me to try the XM bulbs. I did and they were great and cheaper too, what a bargin. I find them whiter and brighter. I have since changed all 6 to XM 10000K
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