The Planted Tank Forum - View Single Post - Convert Lux meter to PAR meter?
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Old 10-11-2012, 01:14 AM   #146
Hoppy
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Quote:
Originally Posted by h4n View Post
very nice Hoppy!
i'm going have to order some acrylic tube and give this a try haha.
I noticed you now use 4 filters. Using the 6 you sent me orginally does the same thing correct?
No, with the 4 filters, the meter reads 10X PAR, so the 20,000 scale on the meter reads actual PAR. What I sent you made the meter read PAR, but not as accurately as with the 4 filters.

Look for a Rosco dealer near you and pick up a free sample stack from them, then you have enough of each of those 4 filters to make at least 4 meters. You could make a lot more, but then you have to worry about centering the filter stack over the window for the photodiode. With the 3/4 inch squares I used, the filters can't slide off far enough to be a problem.
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