The Planted Tank Forum - View Single Post - Convert Lux meter to PAR meter?
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post #44 of (permalink) Old 06-21-2012, 07:12 PM
Children Boogie
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Join Date: Dec 2006
Location: Cincinnati
Posts: 16,466
You might need a semi-opaque acrylic material to make it a real cosine diffuser.
The parabolic curve (output) may be too steep with your frosted semi-sphere. Calibrating that won't be fun. I found out that the light box acrylic I used works pretty darn well. It doesn't have to be a curve/lense.

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