I was thinking about and experiment for photosynthetic spectral analysis for a given plant. Since some of the wavelengths are codependent, you could not just examine them one by one. You would need to have all of them on at once, and reduce the amount of just one until the O2 output of the plant decreased. Then you would know you'd gone below the max. If you had the right equipment, this would be extremely simple. Though, you'd need an O2 meter to quantify photosynthesis, and you'd need exact amounts of light for every wavelength running simultaneously.

Do you have 200 lasers we could calibrate?



Maybe trial and error would be a better way to go...