>What if PHOT without wavelength wouldn't disappear
That might break the LightPC, I think some calculations depend on that behavior.
@minecraft-physics (View Post)
But how do you detect the value of individual bits? The only way I know of is to send the colour through FILT (AND mode, with ctype set to a single bit), and see whether there's any output. But that relies on the photon disappearing when there are no wavelengths.