Practically it is impossible to optimize temperature for each specific plant and each specific stage. For most plants the set point for room temperature during the day is 22 ± 2°C.

Night temperature is usually a few degrees lower.

Temperature in the culture container is higher (up to 5°C) than room temperature due to the greenhouse effect.

One of the major problems is to have a uniform temperature in the culture room. There are gradients.

Safety device: a maximum thermostat needs to be installed, which switches off the lights in case of too high temperature.