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Old 11-05-2011, 04:37 AM   #17
Planted Tank Obsessed
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Originally Posted by DogFish View Post
I've looked at few PAR38 bulbs most are 1000+ Lumens. What I can not seem to find is info on how high to mount them over a 15" deep tank (12" to the substrate.)

Please check post #12, you will find a chart of 6,700K PAR38 bulb with high reference. However, all values are in PAR not lumens because lumen is a unit for human eyes not grow light.
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