Why are lenses preferred over reflectors for many LED luminaires?


LEDs are directional sources of light as opposed to the traditional luminaires, which are omni-directional. When LEDs are fitted with reflectors, much of the light at the center of the beam passes out of the system without even touching the reflector. This reduces the scope of modulation of the beam of light and can cause of glare. Lenses, however, help guide virtually every ray of light emitted by the LED.