The U.S. Department of Energy recently released a report on the initial performance and reliability of chromaticity sensors used for tunable LED lighting systems.
This study found that a chromaticity sensor used in the control system of a tunable lighting installation has high reliability, even under relatively harsh test conditions. The study examined the initial performance and aging characteristics of a sensor consisting of a series of six photodiodes that respond to different wavelengths to adjust illuminance, correlated color temperature (CCT), and chromaticity.
The sensor devices were exposed to a 5,000-hour accelerated stress test: one group at a continuous room temperature operating life, a second at a continuous but elevated ambient temperature of 75°C, and a third in a temperature-humidity environment of 75°C and 75% relative humidity (also known as a 7575 environment).
No abrupt failure of the sensor was found after 5,000 hours of testing, even in the relatively harsh 7575 environment. Just one parametric failure after 5,000 hours of 7575 testing was observed. Such a failure produces a change in a tunable device that would be noticeable to an observer. Light from the tunable fixture would likely be blue-shifted.
Related Stories
| Apr 18, 2014
Massachusetts Supreme Court clarifies building code liability issue on mixed-use projects
The Massachusetts Supreme Judicial Court recently ruled that distinct portions of a mixed-used building may be treated as distinct and different structures under the state building code.
| Apr 18, 2014
First international buildings among 700-plus certified by BOMA 360 Performance Program
In the first quarter of 2014, the Building Owners and Managers Association (BOMA) International certified 66 properties in the BOMA 360 Performance Program for commercial real estate markets across the U.S and, for the first time, abroad.
| Apr 16, 2014
OSHA proposes $2.3 million in fines against Olivet Management for exposing workers to asbestos and lead
Olivet Management LLC, a real estate development and management company, faces $2.3 million in proposed fines from the Occupational Safety and Health Administration.
| Apr 10, 2014
Green Building Certification Institute partners with Well Building Institute on standard
The Green Building Certification Institute (GBCI), which administers third-party certification for the LEED standard, and the Well Building Institute will collaborate to promote the WELL Building Standard.
| Apr 10, 2014
OSHA’s construction safety advisory committee invites input on construction regulations
The Occupational Safety and Health Administration will hold a meeting of the Advisory Committee on Construction Safety and Health May 7-8, 2014, in Washington, D.C.
| Apr 10, 2014
ASTM’s International Standards in Building Codes now available in DVD and online
The compilation ASTM Standards in Building Codes contains more than 1,300 ASTM construction specifications, practices and test methods, and is now available in DVD and online.
| Apr 10, 2014
New California energy code requires building systems to be ready for demand response energy management
Starting in June, California’s latest version of its Title 24 building code kicks in, requiring several systems come with demand response capability.
| Apr 4, 2014
Green Building Initiative moves to include locally sourced materials in Green Globes
The Green Building Initiative group based in Portland, Ore., met with the Department of Agriculture on a plan to include locally sourced materials in its green building standards.
| Apr 4, 2014
White roofs outperform green roofs in reducing heat-island effect, says Lawrence Berkeley Lab
A new report from LBNL says that white roofs are three times more effective than green roofs at “cooling the globe.”
| Apr 4, 2014
ASHRAE standard aims for consistency in measuring building energy use
The standard answers such questions as: Should the measurements of a building’s area used in the equation to derive energy use per square foot be taken from the exterior dimensions or to the centerline of the wall? And, should storage spaces be included even though they are unoccupied?
