LED + SSL

Republication of Postings from the U.S. Department of Energy (DOE) Solid-State Lighting Program by Jim Brodrick, U.S. Department of Energy Next to energy efficiency, long life is probably the most publicized of solid-state lighting’s (SSL) potential advantages, and plays a key role in any cost-benefit analysis. But understanding how LED lighting products fail, and communicating [...]

The U.S. Department of Energy (DOE) has published the findings of a new study utilizing a highly accelerated life-test method (called the “hammer test”) intended to produce failures in SSL luminaires in a reasonable test period, with the goal of providing insight into potential failure modes. Entitled Hammer Testing Findings for Solid-State Lighting Luminaires, the [...]

Chris Bailey, Director of Hubbell Lighting’s Lighting Solutions Center, writes an interesting blog post about how to evaluate LED luminaires based on drive current and current density. He writes: “When evaluating the working stresses of a semiconductor device, such as an LED, the output current from the power supply or the current delivered to the [...]

LED Journal recently published a useful summary of UL standards applicable to LED lighting, written by Diana Pappas Jordan, Standards Program Manager. Get it here.

Republication of Postings from the U.S. Department of Energy (DOE) Solid-State Lighting Program by Jim Brodrick, U.S. Department of Energy Although A lamps comprise only 10 percent of the lamps currently listed by the LED Lighting Facts program — compared with 60+ percent that are directional — they represent a key market segment because, to [...]

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 [...]