There are four types of downlight.
1. Open Downlights
2. Enclosed Downlights
3. Adjustable Accent Downlights
4. Wall Wash Downlights
A recessed reflector provides the optics and the finished appearance of the downlight on the ceiling. It's the combination of the lamp and the reflector that determines your lighting effect.
NOTE: Your selection of a downlight's reflector determines if your lighting effect is going to be for general, task, accent, or wall wash lighting.