The Planted Tank Forum - View Single Post - DIY PAR meter, Yeah you heard me
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post #3 of (permalink) Old 11-07-2010, 05:19 PM
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The little photodiode might sense PAR or it might sense nearer to lumens, or anything in between. Considering the cost, that slight disadvantage isn't that important. It could work well for adjusting the height of T5 lighting, checking how much shading the plants are doing, noting bulb deterioration, etc. But, for getting data that can be compared to other's data, it wouldn't be that great.

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