IIRC, WL have good IR filtering, perhaps 5% IR (I think it's less than that even)? This is a question to ask on lasercommunity, where 90% of the memevers have WL products. (I think Roadrunner on LC posted a ncie comparison between his labby, nexus, and ebayser showing the IR content)
I believe RR was figuring around 1-3% on the WL pointers, which is pretty in line with most of the truly filtered pen-size lasers. The WLs are what we would normally just call "filtered" lasers as the residual IR is too minute to worry about on a pen-laser.
