LED + SSL

The U.S. Department of Energy’s CALiPER program has released Report 20.4, which is part of a series of investigations on LED PAR38 lamps. Report 20.4 focuses on lumen maintenance, chromaticity maintenance, and catastrophic failure in 32 of the Series 20 LED PAR38 lamps and eight benchmark lamps, which were monitored for nearly 14,000 hours at [...]

Comprised of one or more LED modules together with an LED driver, variations in light engine output account for most of the variations in LED color temperature, brightness and other output characteristics. This can be problematic for manufacturers as well as end-users wanting consistent brightness and color. To alleviate this problem, many LED light engine [...]

In April, I contributed a feature story to ELECTRICAL CONTRACTOR that attempted to capture a snapshot of leading trends in LED luminaire design. Here’s an excerpt: In 2014, the Royal Swedish Academy of Sciences awarded the Nobel Prize in Physics to a group of scientists for their 1990s invention of efficient blue light-emitting diodes (LEDs), [...]

The Lunder Conservation Center held a one-day symposium on LED lighting in museums in March 2013, which included a series of presentations by museum and lighting specialists. Here’s Gordon Anson, chief lighting designer for the National Gallery of Art.

The Lunder Conservation Center held a one-day symposium on LED lighting in museums in March 2013, which included a series of presentations by museum and lighting specialists. Here’s Naomi Miller of PNNL.

The Lunder Conservation Center held a one-day symposium on LED lighting in museums in March 2013, which included a series of presentations by museum and lighting specialists. Here’s Scott Rosenfeld, lighting designer with the American Art Museum and Renwick Gallery.

Republication of Postings from the U.S. Department of Energy (DOE) Solid-State Lighting Program by Jim Brodrick, SSL Program Manager, U.S. Department of Energy High-flux lighting applications in high-temperature environments present a formidable challenge for LEDs. The higher the luminous flux from a luminaire, the more difficult it can be to properly dissipate the heat, to [...]

I wrote this article for the March issue of tED Magazine. Reprinted with permission. The year 2014 represented a major milestone in adoption of LED technology in terms of demand and product design. With energy savings as high as 30-40 percent (not including additional control impacts), long rated life (with the promise of little or [...]

I wrote this article for the April 2015 issue of tED Magazine. Reprinted with permission. From walls to paper to plastics to clothing, white abounds in the built environment. Lighting research, however, has focused on the rendering of colors. The color rendering index (CRI), in fact, is based on the rendering of colors by a [...]