Manuals+

Optical Measurement Technology for Light-Emitting Diodes

Light-Emitting Diodes (LEDs) have evolved from occupying a small niche for decades to being nearly ubiquitous. For many new applications, measurement technology that goes beyond a rough estimation of brightness would be beneficial. While not all desires can be met without effort, several possibilities exist.

Colour up your life: Multicolour Power LED Driver with High Power Factor

The rapidly increasing attractiveness of power LEDs for lighting and color accentuation necessitates new multi-channel LED control systems. For the efficient supply and regulation of RGB or RGBW LEDs with direct mains power supply, and with both programmable and manually adjustable color mixing and effects, the STEVAL-ILL019V1 evaluation circuit from STMicroelectronics was presented. Connecting the evaluation circuit to DMX512 or DALI control systems is easily achievable with the implemented microcontroller. Further LED supplies for higher power and even higher efficiency are attainable with quasi-resonant and LLC resonant converters using the L6599A controller IC, as realized, for example, in a reference design for LED street lighting.

Retrofitting: Reference Design for Pendant Luminaires

This reference design demonstrates a method for integrating the Cree XLamp MP-L EasyWhite LED into a pendant luminaire that traditionally used incandescent or compact fluorescent lamps with ballasts.

Water Disinfection with UV Light-Emitting Diodes: LEDs Instead of Low-Pressure Lamps

UV radiation generated by low- or medium-pressure lamps has long been successfully used for disinfection. The use of UV light-emitting diodes is now also being investigated.

Starfall: A Meteor Made of LEDs

A shooting star appears surprisingly and moves so quickly that there is no time for contemplation. Therefore, wishing upon it doesn't work. Electronically, this can be simulated by sequentially switching on a series of white LEDs so quickly that it is just perceptible.

Tuning: LCD Backlighting Technology for High-Power LED Applications

The use of a primary power supply and a multi-channel linear regulator with DHC (Dynamic Headroom Control) is an attractive option for developers who desire an individual power source for each LED string but face challenges when equipping each string with a separate step-down converter. The LM3464 from National Semiconductor offers a compact, cost-effective, and simpler option that still provides high energy efficiency, reliability, and extensive control functions.

For Grabs: Evaluation Boards

Information regarding evaluation boards available for contests or giveaways.

Theory & Application

SIMPLE 8: Control of High-Power LED Lighting Systems

Cool Down: LED Heat Dissipation in Practice

Water Disinfection with UV Light-Emitting Diodes

LEDs Instead of Low-Pressure Lamps

LEDs for Lighting Tasks

Procedure for Selecting LEDs, Heat Sinks, and Optics

LUVLED: UV Power Light Source Based on Light-Emitting Diodes

Colour up your life: Multicolour Power LED Driver with High Power Factor

Tuning: LCD Backlighting Technology for High-Power LED Applications

Retrofitting: Reference Design for Pendant Luminaires

DIY Projects

Board layout data and software/source texts can be found at: www.elektor.de/leds2

Contents Overview

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