CAM Photosynthesis Oxygen Generation?
In the process of photosynthesis light is used as as a source of energy to generate sugar from carbon and water. A by-product is oxygen.

This process can be broken into two cycles: light reaction and Calvin cycle. In the light reaction energy from photons is transformed into usable energy and reducing agents (ATP, NADPH) and water is used as a source of electron, this results in the release of oxygen. In the Calvin cycle this energy coins are used to produce the actual carbohydrates.
There are three known wide-spread mechanisms of photosynthesis: C3, C4 &amp; CAM
One can think of C3 as the &quot;common&quot; system and C4 &amp; CAM as adaptations.
The CAM adaptation is a way to overcome dry, hot climates. The problem is that photosynthesis requires CO2 but opening the stomata allows water to escape. This is not acceptable. CAM plants separate the time of acquisition of CO2 and the actual fixation. They open the stomata at night, allowing oxygen to get out and CO2 to get in but fix the carbon, and thus create the oxygen, during the day.
Although the Calvin cycle is not light dependent it needs substrates created in light conditions so it will not work in the dark under normal conditions.
This article has assimilation curves depending on temperature in different CO2 concentrations. You can use the above equation to estimate grosso modo the amount of oxygen released. They also supply graphs of oxygen change inside a bag following several hours.


Please remember that the amount of oxygen is less important that the concentration, especially compared with CO2