I often wonder about this type of stuff when I do it and wonder and really hope others can demonstrate it also. Then I know I'm not a nut.
Well, perhaps I am, but it's nice when folks actually try such things out and see for themselves. I get awful tired of critics that never do jack

They say today's mighty oak is yestderday's nut that held it's ground.
Would not be the first time.

I'd try it again though.
Think about all the other things you may have overlooked.

My question is less that there is an effect that increases O2, rather, how much and can this level of O2 production be maintained and for how long?

Could we do this daily if there's a problem with growth/algae etc?
I do not like chemical treatment of algae, I think amplification of plant growth and manual removal methods are best.

Some have disagreed, but I think this offers a new tool to help folks see what the potential is and also to help beat back algae at the same time.

Also, make sure you time the exposure to air.
How much is optimal here?

Such questions are harder to answer and you need to measure O2 levels over time to get a feel for that.

So a 10 minute exposure might yield a 10% increase for 2 hours in the O2 production rate at the peak(sort of a sharp peak with along tail after), while a 30 minute exposure (this would require misting the plants with water to prevent them from drying out) might yeild say 15% for 3 hours etc.

What is the maximum we can squeeze out of the plant for a given light level?

Those are much more interesting questions.

Regards,
Tom Barr