Högeffektslysdioder. Möjligheter och förutsättningar för högeffektslysdioder som belysningskälla - ett demonstrationsbygge
This report examines the prerequisites for LEDs to replace other technologies indifferent applications. How does the different technologies for light generationwork and what are the advantages and disadvantages? The various technologieslimitations and characteristics provides the opportunities for the LEDs.This report describes a test-construction built to examine what practical arrangementscan be built with modern light emitting diodes, in order to showsome of the possibilities. The construction consists of three different applications,a high power lamp based on cold white LEDs, one based on warm whiteLEDs for the evaluation of the light characteristics and a RGB-LED based lampable to mix any colors quickly and seamlessly. The test construction also containsthe essential peripherals including control-electronics, optics and a custombuilt watercooling solution.The potential for LEDs is huge but it is complicated to build LED based applicationsdue to the limitations which mainly includes the electronics and theneccesary cooling. If LEDs are going to have a high impact in general lightingthere are some requirements to be met. Either light emitting diodes able to rundirectly from 230VAC has to be developed or the the control electronics has tobe compact enough to squeeze in light emitting diodes in existing luminaires.Both of these solutions are becoming more available on the market right now,but the cost is still high.For special applications such as torches, diving torches, battery powered emergencylighting and stage lighting for concerts and theaters, LEDs are already incommon use. These applications are driving up production volumes for LEDs,making them cheaper and more available. This in turn allows for the developmentof even higher volumes, making the cost of the light emitting diode tospiral downward.