Hi Wind,
Not very sure what lites you have, hope you don't me giving it go to answer you.....
The light tubes you have should be the common FL tubes which is the straight cylindrical type (used in most households). Length should be 1.5 ft with a wattage of 15W each tube.
The PL tube is shaped like a 'U' used in table lamps. The ones mentioned are 36W.
For a fish only tank, the light is not critical. As long the lights are bright enuff for viewing is sufficient.
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