Photon Led
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Over-Heating & Over-Voltage Kill LEDs in RVs
Light Emitting Diodes, aka LEDs, are the greatest lighting source available, but they have two Achilles Heels -- Over-Heating and Over-Voltage. Both of these problems must be considered when choosing RV LEDs.
LEDs are tiny slivers of semi-conductor material (p-n junctions for the geeks who want to know), a piece of silicon doped with rare earths that is mixed to emit photons in the visible spectrum whenever a proper voltage is applied across the junction such that an electrical current runs through the semiconductor. Like a true diode, LEDs resist letting current run in the wrong direction. The chemical composition of the p-n junction determines the wavelength of the emitted photons, so you can have red, amber, green, and blue LEDs, among others.
White LEDs are most often made using a native blue LED that shines blue photons into a phosper that in-turn re-emits a spread spectrum of light across a range that looks like white light to the human eye (for the geek, that is Stokes radiation).
Comparing regular lights to LEDs, the standard incandescent light bulb is only 15% efficient in converting the wattage into useful light. Fluorescent lighting is at best 50% efficient. LEDs have an efficiency of 85% or higher in converting the electrical energy into useful photons. This light source is the most efficient of all the choices we have for light in our RVs, boats, and homes.
All light sources produce some residual heat -- they are not 100% efficient. And it is the heat energy that destroys the light source. With incandescents, the 85% wasted energy is heating the filament to a temperature between 600 and 1200 degrees Fahrenheit. At those high temperatures the filament is literally vaporized away over time, most often within a thousand hours or so, and the bulb simply burns out.
LEDs, too, are heated by the flow of current through the circuit. LEDs will immediately fail when the junction temperature exceeds 185 degrees Fahrenheit. Properly designed LED circuits require two very important features to be successful: protection from over-heating and protection from over-voltage. Often the over-heating is related to over-voltage.
Even when an LED is operated at a carefully controlled voltage, it still generates some heat. This heat must be removed from the LED device at a rate that ensures the junction temperature does not exceed the operating limit. The best way to do this is to place the LED device on a "heat sink" that has the capacity to soak up the generated heat from the LED and move it to a place where it can be radiated into the air or some surrounding heat pit. Early generation LEDs did not bother with this problem since the printed circuit board they were used on was generally large enough to serve as a sufficient heat sink.
As LEDs became more advanced, and more LED emitters were placed upon a single semiconductor device, the problem of heat dissipation became more accute. The good LED engineers are increasingly aware of the need to do a good thermal analysis of the printed circuit board holding the LED chips. Others tried to use the old technology with the new chips, and their products consistently failed.
The heat generated by an LED device strongly depends upon the input voltage to the device. If an LED circuit is designed to handle the heat load and operate only in a 12.8-volt environment, it will not operate well in a 14.7-volt environment. It will deteriorate and die much sooner. It's lifetime will be only a few thousand hours, rather than 100,000 hours. And if the over-voltage ranges up to 18 or 24 volts, the LED device may die immediately.
A fully charged type-27 lead-acid battery typically provides a maximum of 12.8-volts. Some people assume that is the operating voltage of an RV. But if you connect to the Shore Power Pedestal and let your AC/DC converter charge your battery, the line voltage will rise to 13.8-volts. If you have a solar system, the controller may raise the line voltage to 14.7-volts. Battery equalization runs typically increase the line voltage to 16.6-volts for two hours or more.
Most of the early designers producing LEDs for the RV environment assumed a 12.8-volt environment, and their products failed at a remarkable rate in today's RVs and boats. Some learned that if they did not provide some kind of voltage regulation or power regulation on their LED circuits, product failure rates went out of sight.
How the designer protects the LEDs becomes important when you are concerned with overall power efficiency. If the LED circuit has a simple voltage limiter, it "throws" away any excess voltage, reducing the efficiency of your LED in using the available power. On the other hand, if the LED circuit has a power regulator, it converts excess voltage into usable power by taking less current from the main line. Ask your LED supplier how they are protecting their LEDs and what is the cost for such protection. Many of the LED sales people do not understand the basics of the problems with heat and voltage. Will they give you a decent warranty for all conditions, like the full 100,000 hours - about 11 years?
LEDs are a big investment. They are expensive, but if they are constructed properly and used properly, you will have many years of great service, and they will pay back their original cost many times over. But you must be sure the LEDs you use have sufficient protection against excess heat and against voltage vagaries that can destroy them sooner than they should die.
Go for quality, and ask for proof, and a warranty.
About the Author
Sam Penny lives full-time on the road in a 5th-wheel RV. Since 2006 he has developed and sold LED lighting developed and manufactured in the USA at the
Prudent RVer & Boater
website. Penny offers advice, support, and the most reliable LED products for those who pursue a prudent existance with low-energy lighting, both in their RV and their home.
MarketsandMarkets: Global Silicon photonics product Market worth US$1.95 billion by 2014
WILMINGTON, Del.– According to a new market research report, ‘Global Silicon Photonics Market (2009 - 2014)', published by MarketsandMarkets (www.marketsandmarkets.com), the total global silicon photonics product market is expected to be worth US$1.95 billion by 2014, and the U.S. market will account for nearly 52.9% of the total revenues. The global silicon photonics product market is expected to record a CAGR of 82.7% from 2009 to 2014.
Browse 51 market data tables and in-depth TOC on Silicon Photonics market.
Early buyers will receive 10% customization of reports
http://www.marketsandmarkets.com/Market-Reports/silicon-photonics-116.html
The integration of photonics with electronics brought about a new lease of life to the industry. But with the high cost of optical fibers and other optoelectronic components, their adoption remained limited to the high end devices and applications. The search for a cheaper base material ended with silicon that began to be used for photonic applications, thus giving birth to the new science-silicon-photonics. When compared with conventional electronics, silicon photonics provide 90% of its efficiency with one-third of power consumption, at one-tenth of the cost and no requirement of additional manufacturing technology. This makes it more attractive for customers and lucrative for manufacturers. The silicon photonics product market is segmented into silicon waveguides, silicon modulators, silicon optical interconnects wavelength division multiplexer filters, silicon LED and silicon photo detector.
In Silicon photonics market, wavelength division multiplex filter is the largest segment, and is expected to be US$620 million by 2014 at a CAGR of 106% from the year 2009 to 2014. The high market size of wavelength division multiplex filters is due to its early commercialization and wide application area in telecommunication. The photo detector market is expected to be US$301 million in 2014.
Early commercialization of products and high absorption rate of electronic products have made U.S. the dominant market in 2008 with 56.7% share of the global silicon photonics product market. Increased research and developments in U.S. companies have also helped it dominate the silicon photonics market. Europe is estimated to be the second largest with 25% share of the market.
The report is titled ‘Global Silicon Photonics Market (2009-2014)' and was published in August 2009.
Scope of the report
This report, aims to identify and analyze products and devices that use silicon photonics technology. The report has segmented the global silicon photonics market as follows:
Silicon photonics product market
Waveguides, modulator, wavelength division multiplex filters, optical interconnect, LED, photo detector
Silicon photonics product device market
Optical switches, IC, optical transceivers, solar cells, sensors
Silicon photonics applications market
Telecommunication, information processing, Sensing, metrology, Displays, consumer electronics, others
Silicon photonics technology market
Silicon submount technology, passive waveguide technology, passive optical alignment
Each section will provide market data, market drivers, trends and opportunities, top-selling products, key players, and competitive outlook. This report will also provide more than 50 market tables for various geographic regions covering the sub-segments and micro-markets. In addition, the report also provides 20 company profiles for each of its sub-segments.
About the Author
MarketsandMarkets is a research and consulting firm that publishes 120 market research reports per year. Each strategically analyzed report contains in-depth, five-level segmentation for each of the products, services, applications, technologies, ingredients and stakeholders categories. Our reports also analyze about 200 patents, over 40 companies and micro markets that are mutually exclusive and collectively exhaustive. Browse all our 120 titles at www.marketsandmarkets.com.
