Luminance to Hue rotate

I was enjoying the LumaBlur, and though a hue rotate based on luminance would be a cool tox to play with. Here it is for anyone who might find it useful.
LumaHueRotate.tox (1.27 KB)

hey,

how would one go about integrating on top of , say, a video in?

still a beginner and am trying to wrap my head around the application of this