PAR lamps correspond to general service lamps. They produce warm light with excellent colour rendition, full output immediately when switched on and can be easily dimmed. The PAR lamp has defined beam angles due to the parabolic reflector. In their basic form, downlights direct light downwards in narrow or wide beams and can especially be used to produce ambient lighting. The higher a room is and the larger the ceiling, the more anyone looking up is likely to be dazzled by light from the luminaires.

Downlights installed in particularly glare-sensitive areas - for example, over conference tables - should be fitted with reflectors which provide exceptional glare control.