Mike, Im using reg florescent lights. 4 footers, however due to the odd size room ( 11x19 ) I cant fit even lighting. i also have a peninsular that im trying to light but in a way that the lights are as hidden as possible to maintain the shadowbox effect.
mecu18b, The LED strip lighting is much easier to handle than the fluorescents if you need to get it behind a valance. I couldn't tell if your existing lights are surface mount or in a suspended ceiling. My main lighting is fluorescents in the suspended ceiling, but I also had many issues with getting even lighting because it was restricted to space between floor joists.
While the LED strip lighting is surface mounted, it projects no more than 1/2" below the ceiling. I've thought about adding some minimal valances made out of black foamcore board to shadowbox it, but just haven't seen that it's really needed if you have a low ceiling now that I've been using it for awhile. Along one side of the room is an area where there's a support beam that the light strips hide behind like a valance and that works well, I just didn't see trying to follow all the curves in the light strip in much of the rest of the room.