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The conversion values I am not worried about. They came from Apogee and were specific to various light sources including my exact bulb. Any significant error is more likely to come from my shitty light meter measuring lux. But even so, I don't expect this to provide more than a VERY rough...

Hey, how often do you all replace your bulbs? I know these last a lot longer than HPS or regular MH bulbs, but I think the info I had was not quite right. I had read that they maintained 85% PPF at 20,000 hours. I just replaced mine (for the first time) at about 9,200 hours, and it was a HUGE...