You can find plenty of led options at almost any store if you want to spend extra money up front, but yeah you could rig up a socket arrangement to run them or just buy a few T-5 LED shop lights.
Most of the guys on here are building their own lights using Cree COB leds which at the moment this may save you a few dollars on hardware, but you will have to assemble them which can take considerable amounts of time. LED lights are generally more expensive at purchase but they pay you back through efficiency.
I'm still using my lights from 3 years ago and they look just as bright as they ever were, instead of changing bulbs each cycle I open them and clean the interior and the diodes with rubbing alcohol. If you are only planning on using it for veg you can get away with using older leds that are now quite cheap. I advise running them on a longer schedule if you choose to go this route though. I run my old LED's 21/3 when I use them in Veg, which is 3 hours longer than I did with MH, but I ran 300w of LED vs 400w of MH and my veg time was ~3-7 days shorter depending on strain. It also allowed me to move out a fan further reducing energy costs. Unless you want to be disappointed don't drop below 75% of your previous light wattage. Along with the reductions from using less fans, and less AC in the summer, the lights do save quite a bit in electricity. It takes a little time learning the sweet spots between your plants and the lights, but once you are dialed in it is worth the effort. I hope this helps you out. If you look around this section of the forum you can find some really useful threads because a lot of guys on here have been in a position similar to you. I just don't have time to look up threads for you but they are there. Someone else will probably chime in too to help.
Sincerely,
IlovePlants