I've been curious about what you had said, so I went about trying to find out. What I did was build a home-made spectroscope and I sampled several light sources. I went a bit more in depth here: www.deadbread.com/crumbs/spectro.html You were spot-on Ic-racer, there was some green hidden inside the blue LED spectrum. No green in the ultraviolet LEDs; yet there was bit of blue.
Great measurements! What I would like to see is the spectrum of the blue and green grids of the Aristo 4500 and the Zone VI 8x10 VC heads.