Well roughly, yes.

It'll take a certain amount of time to remove 30ppm of CO2 from the water in a closed system.

More light, more uptake.

Longer light, more uptake.

There are practical limits, such as time to get the uptake going and started upon initiation of the light treatment. In the shorter time frames, this becomes more critical.

Length of duration can be a factor also, I'd suggest 4 hours and 8 or 10 etc and look at it from those time frames.

Regards,
Tom Barr