It is always advised that the light above the mirror is soft (but not very soft), enough to see your reflection properly. If the illuminance is very low, while using it for vanity purposes, there might be shadows on your face. The light should equally illuminate your face, so instead of having one it is advisable to have multiple bulbs. At the same time, you shouldn't be using fixtures as this also makes the lighting uneven.
If the light comes from different angles, all parts of your face will be illuminated equally. For example, while applying makeup, you should be sure that both sides of the face are equally made up, but if the light falls differently on both the sides you will never be sure if it isn't really even or the light is showing it as such.
If you have a bathtub, then you should light the area with soft lights. You draw a bath to calm your nerves and relax and with minimum lighting, you can gain the feeling of being in a spa. In case you have a shower, it is better to have lights away from the water, preferably in the ceiling. It should never be a naked bulb, recessed lighting is a good idea as well.
There should be a lot of lights in the bathroom, but you should be sure that you don't put it in an unplanned manner. Plan what use every corner will serve and light it accordingly. LED lights are helpful in this as they are cost-effective and bright.
In terms of colours, it is always better to use yellow light since it isn't harsh. It adds to the aesthetic and makes the bathroom warm, a place to relax. You can also install a dimmer switch to change the light according to your mood and time of the day.
The mirror should also be placed in a way that during the day you have natural lighting. Design the interiors of the bathroom accordingly. There should be ample bright light, it is always great to have an option. Some people also prefer lights over the mirror, so make sure the size of the bulb is proportional to that of the mirror.
Shades over the light may obstruct its illuminance, so if you'd still rather have them, then you should use light colour shades with bright LED bulbs of a higher voltage, probably 60-80 Watts. But the most important thing to keep in mind is all bulbs in the bathroom must be energy saving and cost-effective. Nobody likes to pay an exorbitant electricity bill after all.
While making a bathroom in business places like restaurants and hotels, the interiors are slightly different. People frequent restaurants and hotels to break away from their mundane lives at home and office.
Places like restaurants, clubs and coffee shops require lighting that are long-lasting and can run long hours in the day cost effectively. Since they require lighting at all times and only seldom are they switched off, it is best to choose a LED that is energy efficient. People prefer to have yellow fluorescent LED, however, it is best to use a bulb of 60-80 watts. It makes it easier for people to see their face in the mirror and use it for grooming or touching up. If it is a single door washroom, it is best to have high voltage lighting, but if there are multiple cubicles with a powder room, make sure that is brightly lit. Malls and shopping complexes usually prefer white light or a mix of white and yellow lights. It is best to keep the cubicle medium light and the light near the mirrors to be sharp.
In Hotels, it is preferred that bathrooms use multiple lights for different parts. The light above the bathtub or shower space should have dimmers for the guests to choose their preferences. The main idea behind staying at a hotel is to have a leisure time and relax. Concealed lights are a good idea to create an ambience of relaxation. Guests prefer to have yellow bulbs as it is soft on the eye but is still bright. Over the seat, people prefer a small, soft light, so they can switch that on in case they need to in the night and it isn't harsh on the eyes. Near the basin and above the mirror, the light should be bright so that the face is evenly lit. It is good to have ceiling lights with covers so that the light is not direct and harsh.
Lighting can create or break an ambience. Harsh lighting in place of relaxation (like the bathtub) can change your mood drastically and not positively. While we may undermine the importance of ambience in the bathroom, it has a lot of effect on our mood. And by playing with lights and styles, you can get the perfect ambiance.