Interesting what people say about 532 vs 520. People say 520 is a more "pure" green. Does "pure" mean more comfortable and agreeable to view? IMO, pure green means lime-green. 520 in photos looks a touch more blue-ish and a cooler, more natural looking green. I think that's why people say "pure"?
Photos seem to make them look more different than in real life viewing. Side by side I can tell a difference. But a 520 by itself is somewhat hard to tell. In real life viewing I see 520 as more of a silver/white "diluted" type of green, not a blue-ish green. It's looks like a 532 that's less "rich" in green color. I don't mean that negatively, just hard to describe.
I've heard 532 described as bitter, acidic, electric, lime, etc. 520 is just more comfortable of a color IMO. I've also grown to dislike the power inefficiency & temp sensitivity of 532, and the brightness changes. Meh!!! ^_^
I'm thinking of a high power 520 myself. With a 3-element lens, how's the divergence and quality of the NDG700 700mW? Thanks