The Planted Tank Forum - View Single Post - Carpeting dhg in low light
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post #5 of (permalink) Old 08-29-2012, 04:40 AM
Planted Tank Guru
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 21,015
During the dry start portion you can use a wide range of light intensity, and the effect will mostly be in how fast the plants grow. It is after they are flooded that you can help out by adding DIY or other CO2. How much light you have depends on how far the bulb is from the plants. The intensity drops approximately proportional to the square of the distance from the light. (Double the distance and the intensity drops by a factor of 4.)

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