Optimizing the Performance of White Light-emitting Diodes for Energy-efficient Lighting
Abstract
Over the past decade, high-brightness monochromatic (colored) LEDs have been replacing
traditional incandescent light sources in certain niche applications such as traffic signals and
“EXIT” signs. LEDs are able to save up to 80% energy and significantly reduce maintenance
costs in these applications. A similar trend is expected in architectural, transportation and general
illumination with white LEDs. Even though the efficiency and light output of white LEDs have been
improving steadily, they still need to improve by twice as much and offer good color appearance
before they achieve the target of 200 lumens per watt with high color quality, as set by the SSL
industry.[2]