Block Diagram. Computer Simulation. Color Mixing. Computer Design. Computer Design. Computer design. Outlook in Europe. The Workshop on LED Manufacturing for Lighting & Displays was held in Berlin, Germany on September 10-11, 2007.
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The Workshop on LED Manufacturing for Lighting & Displays was held in Berlin, Germany on September 10-11, 2007.
Significant advances in performance will be needed to realize these expectations, as follows:
• Output of a single white LED to exceed 200 lumens
• Radiant conversion efficiency to exceed 150 lm/W
• Luminance greater than 50 Mcd/m2
• Lifetime greater than 50,000 hours
• Integration into large-area panels
• Integration with driving electronics
• Resistance to harsh weather conditions
Luminaire manufacturers also expressed great interest in LEDs. Among the design advantages offered by LEDs the following were mentioned:
• Very compact dimensions of lighting fixtures
• Can fit in conventional light fittings;
• Dimming is possible without change in colour temperature;
• Colour of light is adjustable with use of multi-coloured LEDs, enabling dynamic colour control and high colour saturation
• Large range of colour temperatures
• Long operating life
• Reduced or zero maintenance costs
• High luminous efficiency
• Absence of IR and UV light
• Safety, because of very low voltage
• Very reduced amount of heat (no risk of burns)
• Cold switch-on (down to -40°C) and higher efficacy at cold temperatures
• Precise directional emission without accessories or refractors
• Use of efficient optics made of polymers
At present, incandescent and fluorescent lamps have a cost-per-lumen ratio of $0.03–0.05 and $0.06, respectively. To compete, the figure for LEDs needs to drop by a factor of 20. But increasing drive current to 2 A and efficacy to 150 lm/W will deliver a nine-fold improvement, which means that we can get into the right ballpark if we can halve the cost of making LEDs.
You and Shanghai University will have a great and bright future