Good Morning-I really need some help. I have 20 centerpieces that are 20x20x16" cubes. They have 11x14"windows cut out from the 4 sides. Each window has a semi-transparent image in the window to make it look like a 4 sided TV. I now need to light the TV's from the inside. I purchased a river rock lantern from target (They no longer carry this item and I can not locate them anywhere!) which put out 85 lumens and was almost bright enough. The one problem was that the light was concentrated towards the middle. I am willing to go the diy/modified route I just don't know where to start. The ideal solution would light the images evenly and brightly for 6 hours and be cost effective. Thanks so much!