Solid State Lighting: The Future is here

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Solid State Lighting The Future is here

• Xavier Fernando
• Ryerson University

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Incandescent Bulb
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LED Lamp
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How Does LED Works?
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Common LEDs
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White LED
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RGB Based White LEDs

• Advantages
• Excellent Color Rendering (faithful color
  reproduction)
• High lumens/watt
• Color temperature can be tuned by adjusting the
  three colors separately
• More efficient compared to phosphor based LED
• Disadvantages
• Difficult to achieve pure white color
• Lamp to Lamp color variation

(u,v) is the colour coordinates
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Blue LED with Phosphor

• Advantages
• Temperature Stability
• Simpler to create than the RGB LED
• Decent colour rendering
• Disadvantages
• Less efficiency
• Weak lumens/watt
• Board emission spectrum
• Short lift time compare with other type of LEDs

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Relative Energy Vs. Wavelength
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Comparison of different light sources
Incandescent Light
Phosphor Based LED
RGB Based LED
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Power Conversion Efficiency
Power efficiency (lumen-per-watt) is the
measurement of the total amount of light emitted
by a light sources per energy input.
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Directional Illumination
Lights from LEDs can be directed effectively to
where it is needed, compensating for their lower
luminous efficiencies.
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Lifetime
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LED Traffic Signals
Compared to filtered incandescent signals

• LEDS use 80 to 90 less energy than incandescent
  signals
• No need for colored filters
• Longer life
• Reduce maintenance costs

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Specific Application Signs and Contour lighting
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Specific application Medical Equipments
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Future