This complements the information about the aquarium light located under this link Aquarium light in the main menu. Reading that article about aquarium lighting should help you to understand the parameters listed in the table (6500K, spectrum, etc.). Will also help to understand which parts of the spectrum are most important. This will help with the final selection of the suitable fluorescent light bulb for your aquarium.
The following list of prices, sizes, power and spectra of individual tubes has been created to show you what is available on the market. I hope that will help you to choose fluorescent light bulb.
For T8 type fluorescent lamps you may use a special electronic stabilizers, the price ranges for 1x15W ($15), 2x36W ($29) and 4x18W ($33). Electronic stabilizers eliminates blinking effect of the fluorescent tubes and saves energy.
For T5 type fluorescent lamps you will need to use a special electronic stabilizers, the price ranges for a single fluorescent light bulb approximately $26 for two tubes about $29, and for three of about $33. Electronic stabilizers eliminates blinking effect of the fluorescent tubes and saves energy.