The Planted Tank Forum - View Single Post - planting bulb vs cfl help
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post #15 of (permalink) Old 08-30-2012, 09:31 AM Thread Starter
Planted Tank Obsessed
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Join Date: Jul 2012
Location: Honozulu, USA
Posts: 318
Originally Posted by Hoppy View Post
That 14 watt CFL bulb should be about 20 inches above the substrate to get 40 micromols of PAR, which is as much light as you need, with CO2 to grow the carpet. Any closer to the substrate and you will very likely have to fight off algae attacks.
How do you calculate the par?
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