That's what I did. I also mentioned this in the post you were replying to. I guess you could be meaning something else, (although I don't see how) so I'll also elaborate what I did in excruciating detail:
I switched the light between blue, green and red. Some blocks remained white under all of them, some blocks remained white under only one of them, some remained black only under one of them, and some remained black constantly. Here are the results I reached for the left panel:
Code:
[SPOILER]NE WW
EE WW
BR GD
BB GG[/SPOILER]
Key:
N = only black under green light
E = only black under blue light
W = always white
B = always black
R = only white under red light
G = only white under green light
D = only black under red light
There were no blocks that were only white under blue light.
From there it was pretty easy to separate them into groups, but the panel refused to acknowledge that as the correct result. I have summarily concluded that this puzzle is shit.