There is no rule such that the bathroom lighting should be provided only in the ceiling or is better if it is provided at the sides or on top of the mirror. One has to fix the bathroom lightings according to one's taste and the mood that he or she wants to bring into the room. Even for a small bathroom, people, these days, go for two or more lighting fixtures. Thus, lighting is the most important factor to be considered in any modern bathrooms.
Bath lighting must meet three conditions: to be functional, aesthetic and to have a special ambiance. For the daily tasks (shaving, make up, etc.) you needed a strong light and for moments of relaxation, such as a bath in the tub, you need a discreet light. Also the bulbs that you use must provide the amount of light needed to properly light this room.
Ambient bathroom lighting is a very popular choice For providing ambient illumination, the use of chandeliers and pendants are recommended. You need to keep in mind that bathrooms have the presence of a high degree of water vapor; this leads to the cracking of very hot bulbs which are exposed. Chandeliers and pendants have exposed bulbs, so think twice about their placement before having them installed.
The bathroom lighting contemporary task light, serve to provide light for the various grooming functions that are carried out in the bathroom. As a result this category of light focuses on the vanity area, shower stalls, or over bathtubs and toilets. Sconces or vertical fixtures on both sides of the vanity, or that center mirror that you use to shave, brush your teeth or put on makeup are excellent task lights.