Infrared lamp

Round bulbs, often tinted red to reduce visible light, provide infrared radiant heat suitable for warming of people or animals, but the power density available is low.

Solid-state light emitting diodes can be produced to be efficient sources of near-monochromatic infrared energy.

A light emitting diode can be closely coupled to an optical fiber, allowing infrared signals to be sent up to scores of kilometres without amplification.

[7] IR data transmission is also employed in short-range communication among computer peripherals and personal digital assistants.

It responds only to the rapidly pulsing signal created by the transmitter, and filters out slowly changing infrared radiation from ambient light.