This is a very standard LED. The lens is 3mm in diameter, and is diffused.
1.8-2.2VDC forward drop
Max current: 20mA
Suggested using current: 16-18mA
Luminous Intensity: 150-200mcd
Tech Tin Files: LED lifetime and failure
Solid-state devices such as LEDs are subject to very limited wear and tear if operated at low currents and at low
lifetimes quoted are 25,000 to 100,000 hours, but heat and current settings can
extend or shorten this time significantly.
The most common symptom of LED (and diode laser) failure is the gradual lowering of light output and loss of
efficiency. Sudden failures, although rare, can also occur. Early red LEDs were notable for their short service
life. With the development of high-power LEDs the devices are subjected to higher junction temperatures and
higher current densities than traditional devices. This causes stress on the material and may cause early
light-output degradation. To quantitatively classify useful lifetime in a standardized manner it has been
suggested to use the terms L70 and L50, which is the time it will take a given LED to reach 70% and 50%
light output respectively.
LED performance is temperature dependent. Most manufacturers' published ratings of LEDs are for an operating
temperature of 25C (77F). LEDs used outdoors, such as traffic signals or in-pavement signal lights, and that
are used in climates where the temperature within the light fixture gets very high, could result in low signal
intensities or even failure.
Since LED efficacy is inversely proportional to operating temperature, LED technology is well suited for supermarket
freezer lighting. Because LEDs produce less waste heat than incandescent lamps, their use in freezers can save on
refrigeration costs as well. However, they may be more susceptible to frost and snow buildup than incandescent lamps,
so some LED lighting systems have been designed with an added heating circuit. Additionally, research has developed
heat sink technologies that will transfer heat produced within the junction to appropriate areas of the light fixture.