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Lighting type?
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eti:
Does anyone know what sort of lighting (LED? Incandescent?) would cause the girls to "disappear" (or more like blend in / camo against drapes and stage) like this; is this UV? Stunning dancing!!

ajb:
That just looks like really, really saturated blue light.  Could be done with incandescent and color filters if you're willing to accept extremely low efficiency (way worse than incandescent sources in general I mean) and replace your color filters every show.  Nowadays LED sources will do that way better, and I'd assume that's what they're using.  LED stage lighting fixtures capable of additive color mixing (RGB+W, sometimes with variable color temperature white, and sometimes with additional monochromatic LED colors to expand gamut/improve saturation) are quite common these days.  It's not UV, which would look more like pastel-ish purple than blue. 

The basic effect here is that with light in a single saturated color--and LEDs with their sharp monochromatic output are about as saturated as you can get--it ceases to matter what color the things you're illuminating are.  With white light, or simply less saturated colors, the objects that are being illuminated will reflect some wavelengths more than others, so you can still discern differences in color between the objects.  But if there's only one color of light, there's only one color that will be reflected by the illuminated subjects, and you lose the ability to differentiate the colors of the objects.  Some will look 'brighter' than others if they happen to reflect more of that wavelength, but that's it. 

The fact that it's blue also helps here, human eyesight tends to not do as well with blue, and camera sensors seem to have a more difficult time with it as well.  The trick would be slightly less impressive in real life, there's a sort of compression effect inherent to recording something with a camera and playing it back on a screen, both in terms of color/luminosity resolution (the human eye has extremely good dynamic range) and in the fact that you lose the depth information that comes with direct viewing via parallax and focus information from your eyes. 
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