Advanced LED Lighting Technology
LED Lighting Makes Economic Sense

Evolution of Lighting

Sun light: nuclear reaction
Combustion: chemical reaction (candle, camp fire)
Incandescent: resistive heating
Gas discharge: fluorescent, high pressure metal lamp, metal halide
Electroluminescence: LED

Evolution of Lighting

LED Long History and Wide Applications

1962 First visible LED invented by Nick Holonyak at GE
1993 Shuji Nakamura (Nichia) discovered practical high brightness blue InGaN LEDs
1995 First phosphor converted white LEDs launched
2008 White LED efficiency performance of 100 lm/W at room temperature on market

LED Long History and Wide Applications

White Light LEDs

White Light LEDs

Color Rendering Index (CRI): Color quality

Color Rendering Index (CRI): Color quality

Benefits of LED Lighting

Lighting is in transformation – one of the last major industries that is dominated by 19th Century technology
Solid-state lighting revolution is well under way
Advantages of LED technology:
– Energy efficiency: potential to 90% (current ~ 30-80%)
– Long life-time
– Compactness and Robustness
– Size and form factor
– Instant on/no warm up time
– Minimal non visible radiation (e.g, Ultraviolet (UV), infra-red (IR))
– Full color in entire visible spectrum
– Digital control: low voltage operation and fast response
– Dimming and sensor control capability