So I've done a pretty good job of keeping all my stuff out of direct sunlight. However, I do recall that there are some lightbulbs out there that still cause yellowing on plastics. I can't seem to remember which kind though. Is it the flourescents that cause yellowing or the incandescents? I'm pretty sure LED's don't cause yellowing at all. Are there any recommended lightbulbs out there that provide great light and don't cause yellowing to the figures?