He did, but that is still 8 hours of peak lighting per day which is more than most people run.
That was the point I was trying to get at.
The whole purpose of the study was to determine when the peak production of zooxanthelle was, and the affect of light dependent and light independent reactions.
Basically, using the peak production time, while allowing the algae cells to essentially recharge. Thus, gaining two max growth periods in 24 hours.