The Planted Tank Forum - View Single Post - DIY PAR38 LED Track Light
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post #13 of (permalink) Old 12-06-2011, 02:32 PM
No more Bow ties
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Be aware that a PAR meter will only read light wavelengths between 400 - 700 nm (around that). A lux meter will vary drastically depending on what photo resistor/diode it uses.

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