台灯专用LED照明参考设计.pdf

TND358/D Rev 2, June - 2009 White Paper A Halogen Desk Lamp Conversion to LEDs that meets the ENERGY STAR® SSL Power Factor Requirement for Residential Luminaires Page 1 of 10 Jim Young/Bernie Weir 29 May 2009 It is estimated by the International Energy Agency that more than 19% of electrical energy demand globally is used for lighting. As a result, there has been significant effort around the globe in replacing in-efficient incandescent light sources with higher efficiency solutions. Much of the focus in curbing this demand at the consumer level has been in programs to drive adoption of compact fluorescent lamps (CFL). The choice of using CFLs is not without consequence; each bulb contains mercury which, when not disposed of properly, ends up in landfills. Moreover, the form factor is not ideal for all lighting applications. An alternative which has been gaining significant attention is phosphor converted “white” LEDs. LED lumen output and efficacy – the measure of lumen output versus input power - continues to make significant progress year over year while, at the same time, the cost in terms of lumen/$ is falling. Beyond energy savings, High brightness LEDs can have lifetimes of greater than 50,000 hours when properly designed and operated which eliminates the cost of replacing bulbs. An off-the-shelf halogen desk lamp was used as the basis for a demonstration of the real world performance of today’s latest production LED light sources. A Cree XLAMP® MC-E LED was used as the light source. This product incorporates 4 LEDs in a single compact package which is idea