I bought the 5050 RGB LEDs and they are bright enough to illuminate a case I think but I tested it in my lightbox and it simply wasn't enough light going through the semi transparent white acrylic so I went back to CCFL which the ones I had were about double the brightness and barely enough for the lightbox application. Mind you the 5050 white might be brighter than my RGBs though
BTW OT but this is my setup for now
ultimately you do need a certain depth to achieve even light distribution. Unless you can find a backlight setup from an LCD TV (I tried but the parts are impossible to find here in NA e.g. most importantly need a diffusing acrylic panel) that be perfect but the only ones I found are actual backlit lightboxes and they cost a bundle
"Resistance is Futile"