Getting a good diffusion is all about distance. because the clear parts are so shallow, its hard to do....but i have ideas, if i were ever to do one again. If someone was going to make a traditional HIC, it would be easy to get that distance for diffusion. But on a fridge, there isnt a ton of options.
I hoped that by imbedding the LED's in the clear Epoxy, it would help a bit.