Range of New and Potential New Applications of LEDs

Nowadays, LED products are being used in numeric displays and indicator lights to a range of new and potential new applications, including exit signs, accent lights, task lights, traffic lights, signage, cove lighting, wall sconces, outdoor lighting and downlighting.

The following is the list of LED applications:

•    Streetlights
•    Large scale video displays
•    Architectural lighting
•    Status indicators on all sorts of equipment
•    Traffic lights and signals
•    Light source for machine vision systems, requiring bright, focused, homogeneous and possibly strobed illumination.
•    Exit signs
•    Motorcycle and Bicycle lights
•    Toys and recreational sporting goods, such as the Flashflight
•    Railroad crossing signals
•    Continuity indicators
•    Flashlights, including some mechanically powered models.
•    Emergency vehicle lighting
•    Elevator Push Button Lighting
•    Thin, lightweight message displays at airports and railway stations and as destination displays for trains, buses, trams and ferries.
•    Red or yellow LEDs are used in indicator and alphanumeric displays in environments where night vision must be retained: aircraft cockpits, submarine and ship bridges, astronomy observatories, and in the field, e.g. night time animal watching and military field use.
•    Red, yellow, green, and blue LEDs can be used for model railroading applications
•    Remote controls, such as for TVs and VCRs, often use infrared LEDs.
•    The NintendoWii's sensor bar uses infrared LEDs.
•    In optical fiber and Free Space Optics communications.
•    In dot matrix arrangements for displaying messages.
•    Glowlights, as a more expensive but longer lasting and reusable alternative to Glowsticks.
•    Grow lights composed of LEDs are more efficient, both because LEDs produce more lumens per watt than other alternatives, and also because they can be tuned to the specific wavelengths plants can make the most use of.
•    Movement sensors, for example in optical computer mice
•    Because of their long life and fast switching times, LEDs have been used for automotive high-mounted brake lights and truck and bus brake lights and turn signals for some time, but many high-end vehicles are now starting to use LEDs for their entire rear light clusters. Besides the gain in reliability, this has styling advantages because LEDs are capable of forming much thinner lights than incandescent lamps with parabolic reflectors. The significant improvement in the time taken to light up (perhaps 0.5s faster than an incandescent bulb) improves safety by giving drivers more time to react. It has been reported that at normal highway speeds this equals one car length increased reaction time for the car behind. White LED headlamps are beginning to make an appearance.
•    Backlighting for LCD televisions and displays. The availability of LEDs in specific colors (RGB) enables a full-spectrum light source which expands the color gamut by as much as 45%.
•    New stage lighting equipment is being developed with LED sources in primary red-green-blue arrangements.
•    Lumalive, a photonic textile
•    LED-based Christmas lights have been available since 2002, but are only now beginning to gain in popularity and acceptance due to their higher initial purchase cost when compared to similar incandescent-based Christmas lights. For example, as of 2006, a set of 50 incandescent lights might cost US$2, while a similar set of 50 LED lights might cost US$10. The purchase cost can be even higher for single-color sets of LED lights with rare or recently-introduced colors, such as purple, pink or white. Regardless of the higher initial purchase price, the total cost of ownership for LED Christmas lights would eventually be lower than the TCO for similar incandescent Christmas lights [citation needed] since an LED requires much less power to output the same amount of light as a similar incandescent bulb. More to the point, LEDs have practically unlimited life and are hard-wired rather than using unreliable sockets as do replaceable bulbs. So a set of LED lights can be expected to outlive many incandescent sets, and without any maintenance.
•    LED phototherapy for acne using blue or red LEDs has been proven to significantly reduce acne over a 3 month period.[citation needed]
•    As a medium quality voltage reference in electronic circuits. The forward voltage drop (e.g., about 1.7 V for a normal red LED) can be used instead of a Zener diode in low-voltage regulators. Although LED forward voltage is much more current-dependent than a good Zener, Zener diodes are not available below voltages of about 3 V.
•    Some flatbed scanners use an array of red, green, and blue LEDs rather than the typical cold-cathode fluorescent lamp as the light source. Having independent control of three illuminant colors allows the scanner to calibrate itself for more accurate color balance, and there is no need for warm-up.
•    Light bulbs
•    Lanterns
•    Computers, for hard drive activity and power on. Some custom computers feature LED accent lighting to draw attention to a given component. Many computer manufactuers use LEDs to tell the user its current state. One example would be the Mac, which tells its user when it is asleep by fading the LED activity lights in and out, in and out.

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