Infrared illuminators are used in areas where light is not sufficient for surveillance. They are generally used with black and white cameras since these cameras have greater sensitivity to infrared light. Color cameras that switch to black and white at night are coupled with IR illuminators for night time surveillance, making them suitable for both day and night viewing.
Infrared illuminators use light emitting diodes, or LEDs, to transmit light. A single LED produces only a small amount of light so banks of LEDís are used. These banks can last up to 100,000 hours. LEDs are therefore extremely economical as well as efficient.