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While there is no question LEDs can perform at levels never previously seen by the lighting industry, there are a few key items to look for when reviewing published data.
While it is important to evaluate a product on paper, evaluating actual performance can be just as important when choosing a product. |
All photometric testing should have been completed in accordance with IES LM-79 standards and all life ratings based on IES LM-80 data. These IES standards were created specifically for high powered LED lighting with the aim of providing an 'apples to apples' comparison of published LED performance data.
The testing should be representative of an installed application, not a single LED component. External factors play a large role in Solid-State performance and it is crucial to account for all of those factors when testing the product. System level designs already account for many of these external factors, ensuring the installed application will meet the published performance data.
Specification documentation should provide all information which could potentially affect product performance. Operating temperature (Tj) for the luminaire at 25°C ambient can provide a reliable benchmark, but the maximum ambient temperate is important when evaluating a system's limits. Driver efficiencies will affect system performance and should always be included in efficiency calculations.
Although all LEDs shift color over time, some do more than others. CRI and CCT shifts should always be published. |
LEDs are very compact point sources, and can produce an incredible amount of glare. Always look for a product with
proper shielding and secondary optics. Products which maximize efficiency while reducing glare will provide the best of both worlds.
CRI can provide a benchmark when evaluating the quality of the light. However, to truly evaluate a product it is important to experience the color rendering first hand. |
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When evaluating Solid-State products and applications Lightolier recommends retaining a qualified lighting professional. You can contact the International Association of Lighting Designers (www.iald.org) to begin a search. |
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