THE LED REVOLUTION. The history of LED’S  1929 - Soviet patent granted for a “ light relay”  1961 - Modern LED invented at Texas Instruments.

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Presentation transcript:

THE LED REVOLUTION

The history of LED’S

 Soviet patent granted for a “ light relay”  Modern LED invented at Texas Instruments  Red LED invented - First mass produced “indicator lights”  1970’s - Used extensively in indicator lights and numerical displays - Increased light output10 X - First colored LED produced

 1980’s - Traffic signals  1990’s - Exit signs and automotive lamps  late 1990’s - First blue LED with vastly increased light output - RGB becomes practical - mainly used theatrically  High brightness white produced using RGB method and phosphor coating method  Introduction of wide array of LED lighting products

Colour White

Which makes them good for applications requiring a spot light.

Watts _______ Efficiency: Lumens, Watts, & Efficacy  Lumens: total “light”  Watts: total power  Efficacy: how much light for the power (lumens per watt, LPW) (similar to miles per gallon)

 Foot Candles: Light per square foot on a surface  Footcandles are what we measure with a light meter  Different tasks require different levels of Footcandles

Color Rendering... Color Rendering Index ( CRI ) How Natural And Normal Do People And Things Appear Under Artificial Light? CRI Scale goes from: , with 100 being the best CRI

Color Rendering Index ( CRI ) STD. METAL HALIDE ( ) DELUXE LUCALOX ( 65 ) LPS ( 0 ) CLEAR MERCURY ( 15 ) LUCALOX, HPS ( 22 ) COATED MERCURY ( 50 ) FLUORESCENT ( 60+ to 92 ) CMH (85+) INCANDESCENT / HALOGEN (100) DAYLIGHT MH ( 90 ) POORERBETTER POORER BETTER The Perfect Light Source... “The SUN” PerfectColorRendering

The Higher The Color temperature, The “cooler” The Color 2700 o 4100 o Fluorescent 2200 o IncandescentLucalox

Common Colour Temperatures Approx Temp.Light Source 8500KBlue Sky 6500KDaylight Fluorescent Lamp 6000KClear Mercury Lamp 4500KClear Metal Halide Lamp 4000KCool White Fluorescent Lamp 3000KHalogen Lamp, WW Fluorescent 2500K40 Watt Incandescent Lamp 2000KCandle, HP Sodium Lamp Common Colour Temperatures

5000K

4000K5000K

3000K4000K 5000K Currently few LED’s are consistently available in that warm a colour temperature.

Junolightinggroup.com Online training e.luminance

The advantages of LED’S

Size Efficiency Life expectancy Dimmable Low temperatures Toxin free

The challenges of LED’S

Cost Colour Directional distribution Performance Life expectancy of components Colour shift Interface with controls Replacement parts

The best applications of LED’S