The Planted Tank Forum - View Single Post - Convert Lux meter to PAR meter?
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Old 06-18-2012, 07:27 AM   #32
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Power flows from anode to cathode, just like a LED. So to get a positive voltage out, you ground the anode, then measure the voltage on the cathode.

General convention for low-voltage wiring is that when a colored wire is paired with a colorless (white or black) wire, the colored one is positive.

I just checked my LUX meter with a voltmeter to be sure, and it does follow the convention.

Hook one up backwards, chances are nothing bad will happen; apart from it just not working.
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