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Originally Posted by Samw
As of yesterday, I'm at 147.  Hopefully my acros will brighten up and stop dying now with my new VHO Super Actinic bulb and increased water flow.
31.7 w VHO actinic / sq ft
32.0 w PC 50/50 / sq ft
83.3 w MH / sq ft |
yup thats why I don't go for this way of comparason either, but it is better than /gal
the problem with comparing with surface area is that it tells you nothing about actual intensity at a given point in the tank.
for instance I could put 400 watt ushio MH bulbs on normal ballasts on my tank and bump my total up to 165 watt/square foot but I would actualy have less light at any given point in my tank as the PAR output is lower on the 400 watt ushio than I obtain on my 250 watt HQI (this is not speculation but actual measured values.)
so you can see why it is hard to go by any measurment that uses watts.
Steve
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