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Solid State Lighting:Solid State Lighting: The FutureThe Future is here is here
Xavier FernandoXavier Fernando
Ryerson UniversityRyerson University
Incandescent BulbIncandescent Bulb
LED LampLED Lamp
How Does LED Works?How Does LED Works?
Common LEDsCommon LEDs
White White LEDLED
RGB Based White LEDsRGB Based White LEDsAdvantagesAdvantages
Excellent Color Rendering (faithful color reproduction)Excellent Color Rendering (faithful color reproduction) High lumens/wattHigh lumens/watt Color temperature can be tuned by adjusting the three colors Color temperature can be tuned by adjusting the three colors
separatelyseparately More efficient compared to phosphor based LEDMore efficient compared to phosphor based LED
DisadvantagesDisadvantages Difficult to achieve pure white colorDifficult to achieve pure white color Lamp to Lamp color variationLamp to Lamp color variation
22ou-u u ovvv
(u,v) is the colour coordinates
Blue LED with PhosphorBlue LED with Phosphor
AdvantagesAdvantages Temperature StabilityTemperature Stability Simpler to create than the RGB LEDSimpler to create than the RGB LED Decent colour renderingDecent colour rendering
DisadvantagesDisadvantages Less efficiencyLess efficiency Weak lumens/wattWeak lumens/watt Board emission spectrumBoard emission spectrum Short lift time compare with other type of LEDsShort lift time compare with other type of LEDs
Relative Energy Vs. WavelengthRelative Energy Vs. Wavelength
Comparison of different light sources
Incandescent Light
Phosphor Based LED
RGB Based LED
Power Conversion EfficiencyPower Conversion EfficiencyPower efficiency (lumen-per-watt) is the measurement of the total amount of light emitted by a light sources per energy input.
Directional IlluminationDirectional Illumination
Lights from LEDs can be directed effectively to where it is needed, compensating for their lower luminous efficiencies.
LifetimeLifetime
LED Traffic SignalsLED Traffic Signals
LEDS use 80% to LEDS use 80% to 90% less energy 90% less energy than incandescent than incandescent signalssignals
No need for colored No need for colored filtersfilters
Longer lifeLonger life Reduce Reduce
maintenance costsmaintenance costs
Compared to filtered incandescent signals:
Specific Application: Specific Application: Signs and Signs and Contour lightingContour lighting
Specific application: MSpecific application: Medical edical EquipmentsEquipments
FutureFuture