post a link. without specs, we're all guessing.

from what i see, you remove the starter, and you remove the ballast. also, tubes are as bright as the input, and the ones i saw were rated from 85 volts to 250 volts. at 110 volts, it's going to be pretty dim.
let us know how it turns out. i think an LED tube won't spread the light correctly, though.
good luck.