(Day)light

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Hams normally settle into their own routine & day/night cycle & adjust themselves to whatever we might do with lighting but they do naturally respond to changes in day length as well as temperature over the year so it's no just day & night.
I personally think it's good if they can get some sense of natural light.
If you can't open your curtains you could just get a full spectrum light bulb to use in the day, this is the same as daylight, they are very bright so you wouldn't need a strong one.
Hams see more at the blue end of the spectrum & don't see red light well so red lights are good to use at night or in the evening if you just want a low light.