I think you should water and mist "when you switch the lights off" this way it cools the plants and allows time for the water to be absorbed through the stomata of the leaves without the risk of them getting burned, and then when the morning arrives the water has been well absorbed through the root system during the night, allowing optimum conditions to begin a hot days work ... this way there is less moisture, humidity and condensation which can all cause fungus or moulds to form...