The Planted Tank Forum - View Single Post - Lighting an Aquarium with PAR instead of Watts
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Old 12-02-2012, 04:41 AM   #87
Hoppy
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Those charts will give you approximate values for the PAR at the substrate, but if you want to really know what PAR you have with your tank and your bulbs and your light fixture, you have to measure it with a PAR meter.

There is still a lot to be learned, and probably un-learned about various lighting options. For example, what is the effect on PAR using various color temperature bulbs, or bulbs from various manufacturers, or year old bulbs vs new bulbs, etc. Also, do plants really respond the same to 50 micromols of PAR from a LED light made with cool white LEDs and one made with a mix of different colors? Any one with a PAR meter and enough interest can contribute a lot to our knowledge.
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