The Planted Tank Forum - View Single Post - Convert Lux meter to PAR meter?
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post #34 of (permalink) Old 06-18-2012, 05:55 PM
Children Boogie
mistergreen's Avatar
Join Date: Dec 2006
Location: Cincinnati
Posts: 16,743
On the photodiodes, there's a dot on the plastic that indicates the positive side.

Nothing bad will happen unless you run current through it.

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