What does LED stand for?
What is the difference between an incandescent bulb and LED?
LED stands for Light Emitting Diode. A diode is a semi-conductor device that permits current flow in one direction. Semi-conductor diodes are a junction of two materials; one material has a surplus of positive charge (holes), and the other a surplus of negative charge (electrons). When you apply a forward voltage, the electrons and holes are brought together. They combine and release light energy -- the 'light emitting' part of the name.
What is Color Rendering Index (CRI)?
Incandescent creates light by the use of a filament. When power is applied, the filament glows and generates heat - which in turn produces light. LEDs are just the opposite. LEDs create light through a 'cold process'. When power is applied to semiconductors (usually gallium, arsenic and phosphorous), they're stimulated by the movement of electrons, this creating photons. Photons are the light that is visibly seen by humans.
Is there a ban on incandescent light bulbs?
The color rendering index (CRI) is a quantitative measure of the ability of a light source to reproduce the colors of various objects faithfully in comparison with an ideal or natural light source.
What are the advantages to using LED lights?
No; however, there are new U.S. energy efficient requirements that will come into effect beginning January 1, 2011 in California and January 1, 2012 throughout the rest of the U.S. The new law will require all incandescent light bulbs to produce the same amount of lumens (brightness) with less wattage (energy) used.
Do LED bulbs contain Mercury like CFLs?
LEDs bring several advantages to the lighting industry, including high efficiency and durability. With superior life over other lamp sources, their required maintenance is greatly reduced. This translates into energy savings, maintenance savings and an overall reduction in cost of ownership over the product's lifetime.
Why is the lifespan of an LED measured as lumen depreciation?
Do LEDs produce heat?
The lifespan of an LED is vastly longer than that of incandescent, fluorescent or HID lamp sources. Although the LED never really burns out, product lifespan is measured by lumen depreciation.
The Illuminating Engineering Society (IES) currently recommends calculating the life of an LED at the point at which the LED reaches 30 percent lumen depreciation.
Remember, a 25,000-hour rating is not equivalent to lamp life rating. LED life is rated where it has reached 30 percent lumen depreciation. At 25,000 hours an LED would still be operating, but at a decreased lumen output.
Do LEDs attract insects?
LEDs produce very little amounts of heat. The heat noticed in some instances is due to on board components and other factors of the circuit. Inc comparison to incandescent, LEDs produce a fraction of the heat. If LEDs are hot to the touch, they are being overpowered due to improper circuitry.
Can LEDs be dimmed?
No, they do not. Insects see entirely different spectrums of light and are attracted to ultraviolet light. A side note - flowers create "nectar guides", invisible to the human eye and ultraviolet light attracts insects to flowers for reproductive purposes. This is not to say that all bugs aren't attracted to LED lights, but most cannot see the light that LEDs produce.
Will color shift if the LED is dimmed?
It is useful to think of an LED as a current-driven device. The light output is proportional to the drive current over a decent range. Things go a bit odd at the bottom end of the current range, where the LED may flicker or change color. So dimming by reductions in forward current isn't the most useful technique. Instead, pulse width modulation presents a technique to safely dim an LED from 0 - 100% of its nominal brightness. By pulsing the LED with current, and varying the duty cycle of the current waveform, the LED rapidly transitions between on and off, and the relative times spent give the impression of being dimmed.
Can LEDs be damaged if hooked up backwards?
According to the Lighting Research Center, dimming causes LED's to experience a shift in spectral power distribution similar to what happens in an incandescent lamp.
Are LEDs affected by extreme conditions?
Yes, they can. LEDs are diodes and only allow power to pass in one direction. To ensure that you will get the most life out of our LED devices, we add additional circuits to prevent this from occurring in both AC and DC applications.
What does PAR mean?
LEDs are geared for harsh environments. LEDs function from -4°F (-20°C) or above 104°F (40°C). There is no delay or required "warm up time" for LEDs to function.
What is the proper way to dispose of used LED bulbs?
PAR = Parabolic Aluminized Reflector
Follow your local disposal procedure for electronic products with circuit boards in them.
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