after reading about overdriving NO bulbs i had to try it. i have to say it works great. right now i i have a 20 long with a ge P&A 24" OD 4x and a 20 gallon standard with a 18" OD 4x. would like to know if it would be better to to add an additional bulb to each setup and run them in series OD 4X. The light already looks twice as bright but if i understand this whole thing correctly a 20 gallon should have about 60W for the right amount of light-- but currently has a 15W 4XOD = 30W? and the 20 long has a 20W 4XOD =40W? Let me know if i am correct and if it would be better to add extra bulbs in each tank in series and what the output would be.
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