The Planted Tank Forum - View Single Post - Convert Lux meter to PAR meter?
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post #43 of (permalink) Old 06-21-2012, 05:38 PM
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Originally Posted by Hoppy View Post

This shows the dot marked "cathode". Is that the positive side?
Cations are + eg K+, Ca++ etc........metals.........good way to think about it for some.

Tom Barr
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