We simply use a small - maybe 15" - supposedly "daylight" tube lamp behind our 60" set - and I actually have a couple of bent metal "reflectors" ovher that, partially to help direct the light & partially to REDUCE the amount of light that is visible.
I use six undercounter soft-white flourescents that I got for <$15.00 each from Menards. I used 2" velcro "sticky-back" to attach them. I have them connected in series, and I use a foot-switch to turn it on and off. It works well.