Thoughts about this bulb and how large of a screen it would cover?
http://www.ebay.com/itm/PAR38-12-Wat...-/110645822782
Thoughts about this bulb and how large of a screen it would cover?
http://www.ebay.com/itm/PAR38-12-Wat...-/110645822782
Or these.... The 20 or 30 watt ?
I'm trying to size for a 500 gph return line with 4 cubes+ and close to 450 gallon total water volume.
http://www.ebay.com/itm/230950111502...634.m570.l4456
The shape of the second one is better to spread the light; some other types are even better because they have multiple chips instead of one:
http://algaescrubber.net/forums/show...-led-grow-bulb
The people that have used these types of light seem to put the lights about 6 to 8" away on a 12 X 12" screen. This would handle your return, and need at least a 10 w LED on each side for a new tank, or 15-20 w LED on each side for high nutrients.
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