First, Lowryder would probably only harvest a quarter, or a near half in a computer case. LRs would fit and you would probably get some 12-14" plants with CFL lighting. Might be able to cram 2 or 3, hopefully you will get a female with one of these and that will be your harvest.
Second, you could fit about 3 CFLs in a case, remember to exhaust the case. CFL is the way to go, but... If you seriously know what you are getting into with LED. your going to have to buy the right lights and solder in each light.