LED + SSL

The U.S. Department of Energy (DOE) has published the first in a series of four special investigations intended to extend the findings of CALiPER Application Summary Report 20: LED PAR38 Lamps, which was published late last year. The new report, CALiPER Report 20.1: Subjective Evaluation of Beam Quality, Shadow Quality, and Color Quality for LED [...]

Republication of Postings from the U.S. Department of Energy (DOE) Solid-State Lighting Program by Jim Brodrick, U.S. Department of Energy Last year was an eventful one for the U.S. Department of Energy’s (DOE) Solid-State Lighting Program. It would have been unusual if it wasn’t eventful, considering the speed at which the technology and marketplace are [...]

The U.S. Department of Energy’s CALiPER program has released a Snapshot Report on LED A lamps, which utilizes the LED Lighting Facts program’s extensive product database to help industry stakeholders understand the current state and trajectory of the market for that class of products. The key findings include: * The mean efficacy of all A [...]

BUILDING DESIGN + CONSTRUCTION recently published a special LED section in its November issue, which I was happy to contribute. The special section talks about the relationship between LED technology and sustainability building practices, which was a general theme for the issue, and presents several projects that exemplify good design using LED lighting. Check it [...]

Two more interface specifications for LED light engines have been published by the Zhaga Consortium, an international organization that is enabling the interchangeability of LED light sources made by different manufacturers. The interface specifications, designated Book 7 and Book 8, can now be downloaded from the Zhaga website here. Book 7 covers a variety of [...]

Republication of Postings from the U.S. Department of Energy (DOE) Solid-State Lighting Program by Jim Brodrick, U.S. Department of Energy As you may know, the U.S. Department of Energy’s (DOE) CALiPER program tests commercially available LED lighting products and publishes the results in a variety of formats — including Application Summary Reports, which focus on [...]

The U.S. Department of Energy (DOE) has published a new report, Color Maintenance of LEDs in Laboratory and Field Applications. Although concern for parametric failure of LED lighting products has largely been focused on lumen maintenance, color shift is a cause of early failure for some products, especially in applications where visual appearance is critical. [...]

Great snapshot of the LED rebate climate courtesy of BriteSwitch.

Republication of Postings from the U.S. Department of Energy (DOE) Solid-State Lighting Program by Jim Brodrick, U.S. Department of Energy Most of the attention given to solid-state lighting these days focuses on LED products, because OLEDs are several years behind their inorganic cousins in terms of development for general illumination. Despite some encouraging progress (e.g., [...]