The Planted Tank Forum - View Single Post - My inexpensive CFL light solution
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Old 05-29-2012, 06:09 PM   #153
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You don't have to choose between 13 watt and 23 watt, you can also use 19 watt bulbs. As I read the chart for PAR vs distance for those vertically mounted CFL bulbs, at 20 inch distance, 19 watt would still be low light, but enough more than with 13 watt to make a difference for some plants. If you aren't resting the reflectors right on top of the tank, you can always raise them a couple of inches and reduce the PAR considerably. For that reason 23 watt may be best - just raise them a few inches and if that isn't enough light, lower them a little.
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