I know for plant biology that the ammount of light can be too much for certain plants. Good example is Melissa officinalis. Too much light changes the color of the plant to purple wich is cool thought. Grows natural and green if kept behind a window but turns purple already under 21W 6500K CFL(1300 lumens/lux).(tested this myself)

But for cannabis being grown naturally in deserts near the equador. High concentration of light would also need high concentration of other components needed for fotosynthesis?

If i had a laboratory i would be runing tests for diffrent combinations of light+nutrients+Co2+dark time.

Natural co2 levels are around 300 ppm ? and natural light is
10,000â??25,000 lux Full daylight (not direct sun)[2]
32,000â??130,000 lux Direct sunlight
(copied from wikipedia)

lets say we want to simulate best outdoor conditions inside we would need atleast
25000-35 000 lumens per square feet of plants.
We would need to match the nutrient usage at this intense light levels correct?
Lets keep in mind that man made light does not match the full spectrum of light gained from the suns rays.

So maby just maby only one type wavelenght of light could be too much if high enough concentration right ? can anyone confirm this ?