My Groovy!'s got a NG750 UX1K, and it's a lot brighter than the NG750 TWOJ I have in a Minimag. I think the tint is great, looks white to me. Others claim a bit of green, but I don't see it. Or at least, if it does have a bit of a greenish tint to it, my eyes are liking it completely. I'd guess the NG500 would compare similarly.