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Just found something very interesting. The ATI PM was accidently running 2 days without fans on. I checked the par without fan, the highest reading at water level is only 700. Overall, the par readings drop 150 to 200 without fan. I turn the fan back on and raise the speed setting from 7.5v to 9v. Check the par again, the readings are even higher than last month. So cooler lamp produces more par.
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