Hi Judy - That would also work - you can purchase a 15" flourescent tube and portable fixture, with an on/off switch on it at Home Depot for $15.00. Probably makes more sense to have a plexiglass cut to fit the opening, there are different types of plexiglass (6 mills)is what we used, you would need one that you would be able to lean your arms on without cracking.
Wish I knew this before now!!!
I purchased my portable table for the RV, as we travel a lot.