It is wise to use flush-mounted ceiling fixtures, owing to the fact that these come with bulbs that are enclosed by a kind of cover. The cover is essential as it acts somewhat like a lamp shade and helps in diffusing the light as well as protecting hot bulbs from breaking and cracking from contact with water vapor. The best would be to have the right balance of ambient bathroom lighting and task bathroom lighting. This will give your bathroom proper illumination and make your bathroom experience worthwhile.
So, for example, zone 1 is the wettest location, being around the bath and shower. Zone 2 is slightly less soaking, being just outside the immediate bath, shower and basin areas, and zone 3 is the furthest away from these sources of water. So if you're looking for designer bathroom lighting to create a well lit bath or shower area, look for zone 1 lighting, and for bathroom mirror lights and designer bathroom wall lights, bear in mind you'll need either zone 2 or 3.
Ambient lighting is another part of light layering. These are usually your typical uplights. They direct light upwards to allow the light to bounce off the ceiling and into the rest of the room. It softens the light and creates a good glow. Next is accent lighting. This is the kind of lighting that will give an additional spark to the lighting of the room. You can choose to dim it or increase the glare depending on your needs.
Accent lighting: Accent lighting, as the name suggests, draws attention to a certain area or feature of the bathroom. You can use it to good effect to highlight things like an ornate mirror or an artwork or a decorative wash-basin or beautiful tiling.