You can put a light in there if you wish, I'd only have it on about 12 hours a day at most. A small wattage LED would be great. it doesn't have to be red.
What I do is to use natural light. If you want you can install a piece of clear plastic somewhere but I'd just leave that ventilation slot open so natural light can enter. It should give enough light. They don't need much, just enough to eat and drink.
What I do is to use natural light. If you want you can install a piece of clear plastic somewhere but I'd just leave that ventilation slot open so natural light can enter. It should give enough light. They don't need much, just enough to eat and drink.