How many lights do I need in my room?
For optimum lumens, you should have 20 (min) to 60 (max) watts per square foot.
Optimum CO2 Calculator
Why is it better to have more Cu.ft./hr. if using CO2?
The faster you achieve your desired CO2 levels the better. The room gets less heat (exhaust fan comes on faster) with higher Cu.ft. per hour of CO2.