What is LED?

[one-half]LED stands for Light Emitting Diode. Diodes are a semiconductor device that will conduct electricity in only one direction. The device is made-up of layers of silicon and seeded with atoms of phosphorus, germanium, arsenic or other rare-earth elements. The layers of the device are called the die and the junction between the materials is where the light is generated. Different materials and designs have different coloured lights and intensities. LEDs are now bright enough to be considered for applications that traditionally used incandescent bulbs.

Technical advances have dramatically improved the reliability and the performance of LEDs since they were invented in the 1960s. The lifetime for the new generation of LEDs is about 100,000 hours of use, or 30 to 40 years of normal operation. As they are a semiconductor device, they are also very rugged and are not subject to fail when dropped or vibrated as are incandescent or fluorescent lights.

The original LEDs only emitted light of one frequency or colour of light. These were blues, greens, yellows, oranges or reds and they were unsuited for domestic lighting. Recent innovations in materials, doping and die structure have developed high brightness LEDs that emit light in all visible frequencies to produce white light. With Tiger Light working on new technology with LED, we now can provide the same output in light as incandescent or fluorescent light.


[one-half last]Light Comparison Table

Lamp Type Incandescent Compact Fluorescent Luxeon WLED
Efficiency (Lumens/Watt) 5-18 30-79 50-80
Rated Life (Hours) 1,000 6,500 – 15,000 50,000 to 100,000
Durability Very fragile Very fragile Durable
Power consumption (Watt) 5W 7W 2W
CCT deg K 2,652 degrees 4,200 degrees 5,000 degrees
CRI 98 62 82
$ spent after 50,000 hours $175 $131 $20

Colour Temperature Comparison Table

Light source Colour temperature Colour
Sunrise or sunset 2000 k reddish – yellow
Tungsten light 100watt 2800 k orange – yellow
Halogen light 500 watt 3200 k yellowish
Halogen file photoflood 500 watt 3400 k yellowish
One hour after sunrise 3500 k yellowish
Flash bulbs 4950 k white with minimal yellow cast
Daylight at noon 5400 k white
Electronic flashlight 5500 k white
Unclouded daytime 6500 k
Unclouded summertime > 8000 k