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.
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.
Uniform light can be expressed through various bodies, selected according to the size of the bathroom. For a small bath uniform light can be obtained with the help of two bodies of lighting arranged on either side of the mirror, and for a large bath the light may be obtained by using a lightning body affixed to the ceiling, above huge mirrors.
Remember that different kinds of bathroom designs require different kinds of lighting. The lighting you choose for your bathroom will be largely dependent on the room design, personal choice, as well as the bathroom setup. Make sure that the lighting in the bathroom is just right, not very bright and neither too him.
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