Please post the following. Let's use what you can grow and your judgement for whether it is a low-very high light tank. With this in mind, past lighting set-ups are still usefull if you feel confident about the lighting level. If you happen to have >4" substrate or something weird please note it.
Tank volume
Tank dimensions LxDxH
Watts (please break down by lighting type - T12, T8, CF, spiral screw-in CF, etc)
Lighting level (low-very high light)
Notes
Here is an Excel spreadsheet that does Ozz's current article calcs for your for you (lumens/watt for each bulb can be changed in the bulbs book as necessary).
This will help in playing with formulas by using real-life tanks. Please leave this thread as data only and discuss here:
http://www.aquariumadvice.com/viewtopic.php?t=72491 Thank you.
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8gal
24x6.5x12
2x13w CF
med-high
8gal
24x6.5x12
2x13w CF + 20w T12 + 23w spiral screw-in CF
very high
note: 23w spiral CF is on the side with a shade... ~5w usable light?
10gal
20x10x12
2x23w spiral screw-in CF
medium
10gal
20x10x12
18w CF + 15w T8 + 32w spiral screw-in CF
med-high
note: 32w spiral CF is over the top in a gap, only effectively lights 1/3rd of the tank
10gal
20x10x12
23w spiral screw-in CF
low
20gal
30x12x12
2x15w T12
low