The Planted Tank Forum - View Single Post - Convert Lux meter to PAR meter?
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Old 06-14-2012, 04:07 AM   #18
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Sounds like a good plan to me.

Out of curiousity, I fully disassembled the sensor on my Extech LUX meter. There are no identifying marks whatsoever on the actual photodiode. But here's the filter:

Close to what I'd expect from a LUX meter that's intended to mimic the human sensitivity to green. A bit more blue than expected, but that may be to compensate for photodiode response; which is probably biased towards red.

I also tested it for UV/IR pass. Only slight UV reduction. But it's a very good IR filter, I can't see the otherwise bright flashes from a remote control with my camera at all.

May come in handy later should you ever decide to play with alternate filters.
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