The Planted Tank Forum - View Single Post - 12G Long Mr. Aqua w/ 26W CFL - Too little or too much?
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post #4 of (permalink) Old 09-24-2011, 07:48 PM
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I think I have seen 9 watt CFL bulbs ("40 watt equivalent") That should drop the light intensity enough to do without CO2. But, if those little reflectors are not polished aluminum on the inside, the 13 watt bulbs may be just right. The chart was based on a polished aluminum reflector, I think.

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