Although I'm sure CO2 can play a role, the amount of light certainly plays a factor with for example Glosso. You can see this below with pics and various PAR readings at substrate level:
50 micromols:
70 micromols:
90 micromols:
You can also see the increase in light in the pics. The were taken with the same setting on the camera.
50 micromols:

70 micromols:

90 micromols:

You can also see the increase in light in the pics. The were taken with the same setting on the camera.
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