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For compact fluorescent bulbs, the Watt/Gallon calculation is done with the advertised W value and *not* the incandescent equivalent.

Without CO2 you're better off doing less than 2W/gallon so using 2x23W bulbs would be good. However, if they are the spiral type you're losing some of the light because you're probably mounting them sideways. So realistically you're probably only getting 46W total with about 20% loss so 37W effective over 29G you're around 1.3W/gallon give or take.
 
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