The Planted Tank Forum - View Single Post - Convert Lux meter to PAR meter?
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post #37 of (permalink) Old 06-18-2012, 10:42 PM
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Join Date: Jun 2004
Location: Baton Rouge, LA
Posts: 3,349
Even if you can't find the dot, you can still identify the cathode by putting a voltmeter on it. The bare photodiode (with no filters) from mine produced 0.235V in room lighting during last night's test.
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