04-01-2017, 04:35 PM
Join Date: Apr 2005
Location: Brentwood, CA, USA
iTrader Positive Rating: 100%
| | Re: Optimum tank depth?
Originally Posted by Phill
I'm meaning max tank height to achieve adequate light penetration to the hair grass
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Light from any type of lighting drops in intensity with the square of the distance from the light (roughly, but not nearly exactly). Light penetrates water, to any depth we would use, very easily so any tank you can reach to the bottom of with your hands, can be lighted as well as you want with a variety of different light fixtures. "Watts per gallon" is not a way to determine how much light you will have from any light fixture. You need to find a chart of PAR (photosynthetically active radiation) vs distance for the light fixtures you want to use. Then, pick a light fixture or group of light fixtures that give you the amount of PAR you need at the substrate level in your tank. If you want low light, that can be 30 - 40 PAR, or for medium light it can be 40 - 50 PAR, or for high light it can be something higher. The best way to do this is to borrow a PAR meter and actually measure the light you get from a specific light fixture at the distance it will be from the substrate.