That seems like a bad idea, because lasers are monochromatic. Sure, a red laser looks red. But just because you only see 50% of the brightness of the light of

That seems like a bad idea, because lasers are monochromatic. Sure, a red laser looks red. But just because you only see 50% of the brightness of the light of a red laser doesn't mean the absorption of all red colors will be 50%. Seems a lot better to use some very mixed source of light.