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LED 101
Helpful info about light-emitting diodes. Hope it helps.
01
What is LED?
A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting.Appearing as practical electronic components in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness. Please check this website for more information.
02
What are the advantages to using LED luminaries?
The key strength of LED lighting is reduced power consumption. When designed properly, an LED circuit will approach 80% efficiency, which means 80% of the electrical energy is converted to light energy. The remaining 20% is lost as heat energy, compare that with incandescent bulbs which operate at about 20% efficiency (80% of the electrical energy is lost as heat).
03
Why LEDs are considered a GREEN technology?
LEDs are environmentally friendly on many fronts. First, unlike HID (High Intensity Discharge) lamps LEDs contain NO mercury. In addition, some LED luminaries are RoHS (Restriction of Hazardous Substances) compliant and have been designed to provide more than a decade of near maintenance-free service. That means no re-lamping which means no waste. Assuming an HID fixture is re-lamped every two years, that’s five re-lamping cycles over a 10 year period.
Just imagine the benefits of choosing LED:
• No concern over proper disposal (hopefully not simply thrown in a
landfill) of old HID lamps containing harmful mercury.
• No fuel used and the accompanying pollution to service those
fixtures.
• Greatly reduced potential for lane closures and other productivity and
inconvenience-related costs associated with maintaining an HID
system.
• No natural resources lost to produce the replacement lamps that
contain mercury.
• No fuel used to move old-technology lamps from the factory (most
likely overseas), to the distributor, to the contractor, to the job site.
It’s important to keep in mind all the positive and powerful ripple effects that using LED technology can have on the environment.
04
05
Are LED Lights Safe?
Yes, LED Lights are perfectly safe because:
• They emit less UV radiation than any other type of light.
• They are very energy efficient (100 lumens/W) and they are cold to the touch, so they are safe for handling and less likely to start a fire.
• They are harmless when broken by accident.
• Cold white light LEDs may be irritating to some people with light sensitivity, but nowadays warm white light LEDs are available.
Eyestrain is mainly caused by blue LEDs, such as those found on electronic devices. However white LED lights should be tested for
photobiological safety according to the ANSI/IESNA RP-27 standard.
Is it true that LED Bulbs are energy efficient?
Yes. LED's require very little electricity to power them up because they are extremely efficient. Their design converts approximately 90% of the electricity they consume into light. In a conventional light the figure is more like 10 –15%, with the rest of the electricity effectively wasted in lost heat. LED downlights, for example, draw only 5 Watts of electricity to light up compared to 50 Watts drawn by a traditional halogen downlight. That is saving in electricity consumption of approximately 90%. Not bad when the cost of electricity is continually rising.