You can use the screw in bulbs as long as the as the lights meet the requirements for the corals you want. I use a 20 watt 50/50 version of that bulb in my 5 gal
minibow. I believe the ones you see in LFS
are only 10 watts. The 20 watt version can be had at Big Als for about the same price as a 10 watt locally.
I think the incandescent hoods for a 10 gal
can acually be converted to a dual light fixture hood rather easily. I have read that the fixture in the hood is a dual screw in fixture but the other side is covered up. You would have to move it to a center location and reposition the reflector. This is how it is in my 5 gal
mini bow but I only use the one bulb.
28 watt fixtures can be had pretty cheap for a 10 gal
though. This would be enough for some low light corals but I would try to get something brighter. You will want more corals at some point