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light output is measured in lumans, wattage in to light out is not linear. also color temp has an effect of brightness. if I remember right 48xx K is the brighest. 6000k is about 90%. 8000k is about 70% 10000k is about 55%.
I went with 6000K drop in replacement bulbs from Vvme (I got a deal on some through my Matrix fourm for $50 shipped). They are cheaper than your Ebay site.
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