The camera makes it more blue than in real live
Without smoke the beam realy looks purple to me, als the the licht scattered off a wall looks purple to me.
But with a little bit of smoke its real blue. I think this is really the end of 473nm, and maybe even 457 if we can get a tight beam out of them.
this evening I could do some beam shots of two projectors next to each other, one with 473nm and one with 445nm.