1. Clear lenses have no tint or diffusion, produce the greatest light output and narrowest viewing angle. They are designed for applications that require very high intensity but need to be colorless in the off-state. (see Figure I)
   
2. Tinted lenses are used to indicate what the LED color will be when in the on-state. (see Figure J)
   
3. Diffused lenses have tiny glass particles embedded in the epoxy. This spreads the light to a viewing angle of approximately +/-35 degrees from center. These LEDs are often used for applications in which the LED protrudes through a hole in the front panel of electronic equipment. (see Figures K & L)
   
4. Non-diffused lenses that do not have glass particles in the epoxy produce a narrow viewing angle of +/-12 degrees from the center. They are often used in backlighting applications in which the LED is focused on a translucent window in the front of a panel. (see Figure I)

Other viewing factors include the LED's epoxy lens shape, shape of the reflector cup, size and the distance from the LED to the nose of the epoxy lens. The closer the LED is positioned to the nose of the epoxy lens, the wider the viewing angle.