different jobs and are found in all kinds of devices. Among other things, they form numbers on digital clocks, transmit information from remote controls, light up watches and tell you when your appliances are turned on. Collected together, they can form images on a jumbo television screen or illuminate a traffic light.
lasers work in a similar way to Light Emitting Diodes but make purer and more precise beams of light.
What’s so good about Light Emitting Diodes?
- They’re tiny and relatively inexpensive.
- They’re easy to control electronically.
- They last virtually forever. That makes them brilliant for traffic signals.
- They make light electronically without getting hot and that means they save lots of energy.
- Energy efficient source of light for short distances and small areas.
- The typical LED requires only 30-60 milliwatts to operate
- Durable and shockproof unlike glass bulb lamp types
- Directional nature is useful for some applications like reducing stray light pollution on streetlights
- May be unreliable in outside applications with great variations in summer/winter temperatures, more work is being done now to solve this problem
- Semiconductors are sensitive to being damaged by heat, so large heat sinks must be employed to keep powerful arrays cool, sometimes a fan is required. This adds to cost and a fan greatly reduces the energy efficient advantage of LEDs, it is also prone to failure which leads to unit failure
- Circuit board solder and thin copper connections crack when flexed and cause sections of arrays to go out
- Rare earth metals used in LEDs are subject to price control monopolies by certain nations
- Reduced lumen output over time.
Don’t Miss: Greatest Scientists