The Planted Tank Forum - View Single Post - Convert Lux meter to PAR meter?
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Old 06-21-2012, 02:14 AM   #40
Hoppy
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The photo diode, beside a penny. Just barely big enough for me to solder the lead wires to it. This is the same one Mistergreen used in his pioneering PAR meter build, http://www.plantedtank.net/forums/sh...d.php?t=120109
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