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Thread: PAR Meter
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Old 08-27-2012, 11:40 PM   #3
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Or, rather than rent a PAR meter, just buy a cheap lux meter from Amazon or Ebay, and use it to measure the intensity in lux, in the air, then divide by 61 to get a good approximation of PAR, and multiply by 1.1 to get a good estimate of the PAR in a tank of water at the same distance.
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