Bathroom lighting must be sufficient
In the Bathroom, there are two areas: grooming area + bathing area.
Same as the principle of the kitchen, it must be enough light for the operation area. People require cosmetic function in the grooming area, so the bathroom lighting fixtures should be with high color rendering index(CRI) in order to make a good rendition of color. To sum up, the key point is to guarantee sufficient light to fully illuminate this area.
Sufficient light is also needed for the Bath, shower and other areas.
Do pay attention for the bathroom lighting fixtures IP rating, due to the water vapor in these areas, the bathroom lighting should be water-proof with at least IP44, the structure can prevent watering, and need good cooling function.