The Top 10 Most Popular LED Lighting Technical Articles of 2013
In reverse order we have the following:
10. Not all LED drivers provide "clean" light
LED drivers with a poor power factor reflect harmonics back to the mains. As the power consumption of "high-power" LEDs used as light sources increases erratically, there is a risk of "dirty electricity" across the mains. To get to the root of this problem, high-power LED drivers must come with power factor correction explained Stephan Wegstein of Recom.
9. How compact fluorescent lamps work – and how to dim them
Compact fluorescent lamps (CFLs) are replacing incandescent light bulbs at a rapid rate due to their tremendous energy savings and longer lifetime. Additional energy savings can be achieved by dimming, but the electronic ballast required to control the lamp has a higher cost and is difficult to design. Tom Ribarich of International Rectifier Corporation explained how a CFL works, how to dim them, and describes a solution for 3-way dimming applications.
8. Simple solutions for a single-device PWM waveform generator
Budge Ing of Maxim Integrated showed two methods for implementing a stand-alone analog PWM waveform generator. The designs can also be modified to make a dual-device PWM generator.
7. DALI and LED converters for high-tech dimming
Juergen Fink of Tridonic explained that the DALI international lighting standard (Digital Addressable Lighting Interface) is now firmly established in the professional lighting sector. It stands for intelligent light management that enables different lighting levels to be easily controlled, different lighting scenes to be set up and flexible adjustments to be
made to lighting systems to allow for different room usages.
6. Powerful light sources for all projector sizes
Stefan Morgott and Wolfgang Schnabel of Osram Opto Semiconductors considered that as projection becomes more and more widespread the demands on image quality are also increasing. At the same time, there is a trend toward smaller and smaller projectors, including miniature versions for smartphones. Powerful compact light sources are needed to ensure that image quality keeps pace with this process of miniaturization. With its extensive portfolio of LED and laser light sources, Osram offers efficient lighting solutions for all projector sizes.
5. Power factor and solid state lighting – implications, complications and resolutions
Hubie Notohamiprodjo examined the relationship between power factor and solid state lighting (SSL) technology.
4. Overcoming the challenges of driving parallel LED strings
John Betten of Texas Instruments took a look at how to set about overcoming the challenges of driving parallel LED strings.
3. Cooling high-power LEDs: The four myths about active versus passive methods
Claiming a place on the podium is Ed Rodriguez who explained that in high-power lighting, needs are emerging for LED luminaires rated to 100, 200 or even 600 watts (over 60,000 lumens), to cover wide areas. The higher-power heat sinks increase in size and weight exponentially. The consequence is escalation of costs for tooling, assembly, shipping, and installation.
2. H-bridge paves new ways for LED lighting
Claiming second spot in 2013 is an article about a H-bridge circuit. The H-bridge is a classic circuit used for driving DC motors in a user-defined manner, such as in forward/reverse direction or PWM-assisted controlled RPM with the help of four discrete/integrated switches or electromechanical relays. This Design Idea was a novel implementation of this technique for driving white-LED arrays directly from the AC mains in full-wave current-limited mode to realize an excellent flicker-free, energy-efficient solid-state lamp.
1. Do high-power LEDs generate IR heat in the forward direction like a filament lamp?
Our winner for 2013 is Ed Rodriguez the President of OptoThermal Technologies Inc who considered whether high-power LEDs generate IR heat in the forward direction like a filament lamp.
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