2012年11月28日 星期三

What testing is needed for an LED?

The recent ban on the incandescent light bulb, government incentives, and the ingenuity of industry experts have all played a role in LEDs becoming the predominant new product in the North American lighting market today. As this technology continues to rapidly evolve, lighting manufacturers and others involved in the industry are finding it increasingly challenging to validate product claims and keep up with industry standards and testing requirements.

As with most new technology, LEDs tend to be more costly than their conventional counterparts – the fluorescent light bulb – though they have been significantly going down in price. In an attempt to offset the price, lighting manufacturers highlight the performance of their products, some claiming 10-year lifespans compared to the typical one-to-two-year lifespan of traditional lighting products. Since these marketing claims are difficult to prove, new criteria has recently been developed for LEDs to help manufacturers avoid customer backlash and negative publicity and provide verification for their products.

In turn, there are several North American and international energy efficiency programs, each with its own specifications. Some of the most prevalent programs in North America include ENERGY STAR, Natural Resources Canada (NRCan), California Energy Commission (CEC), U.S. Department of Energy (DOE) Lighting Facts, DesignLights Consortium (DLC) and Municipal Solid State Lighting (MSSL). Since specifications reference specific standards, the criteria can vary depending on the individual program but the standards for testing and measurement are the same.

One initiative worth highlighting is the DOE-sponsored Lighting Facts Label, which is a new labeling standard currently mandatory on all packaging for screw-based replacement lamps including incandescent, halogen, CFL and LED models. Modeled after the “Nutrition Facts” Label on modern food packages, the Lighting Facts Label provides information on a light’s brightness, energy cost, life expectancy, light appearance (warm or cool) and wattage. The new label was designed to provide a uniform and user-friendly way for consumers to review product specifications and make product comparisons.

Third-party testing plays a key role in product certification. Nationally Recognized Testing Laboratories (NRTLs), organizations approved by OSHA, provide unbiased assurance that products meet the requirements of industry standards and energy efficiency programs and confirm consistency through proficiency tests and factory inspections.

Typical areas of testing and measurement include total luminous flux, luminous efficacy, correlated color temperature and electrical power consumption, among others.The washingmachines is a type of lift mechanism that was used first used on Millennium Force at Cedar Point in Sandusky While most tests are done directly within the lab, they can also take place at a company’s manufacturing facility if necessary.And the laserengraverkk and cutting machine got the FDA certificates. In that case, the manufacturer must participate in a data acceptance program with the third party lab, which is an industry known methodology that ensures testing results remain unbiased. Data acceptance programs can be used for both performance and safety testing.

When testing LEDs, an integrating sphere and a Type C goniophotometer are the two main types of equipment used. The integrating sphere provides certain key values such as color temperature, and the goniophotometer identifies how the light will project. For example, if a product is placed in a 360° plot, the goniophotometer will tell what area will light up at a given distance, allowing architects to project light paths and determine where they should place lights.

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