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
| Mar 4, 2014
Massachusetts Congressional delegation asks FEMA to slow flood zone map requirements
After a recent successful challenge of the scientific methodology used to redraw the coastal high-hazard zones, the Massachusetts congressional delegation is asking federal officials to put the brakes on new flood zone maps for the Bay State.
| Mar 3, 2014
Injury-liability law responsible for higher construction insurance cost in New York
Construction contractors and developers in New York state face $3 billion more in costs and 667 more accidents per year because of a state law that holds builders solely liable for such accidents, according to a study commissioned by the New York Civil Justice Institute.
| Feb 28, 2014
GBI issues guide to help federal agencies meet sustainability mandates
The Green Building Initiative has released “The Guiding Principles Compliance for New Construction,” for federal buildings to help federal agencies meet sustainability mandates in the construction of new buildings.
| Feb 28, 2014
Steel Joist Institute standards open for review
The 2015 draft of the Steel Joist Institute’s “Single Joist Standard Specification for K-, LH-, and DLH-Series and Joist Girders” will be available for public review until May 31, 2014.
| Feb 28, 2014
Metcalf Construction wins key reversal from federal appeals court in Hawaii on military contract
Metcalf spent more than $76 million on a military construction project and sued to recoup costs.
| Feb 19, 2014
Obama Administration moves to boost fuel efficiency standards on heavy-duty vehicles
The Obama Administration wants to boost fuel efficiency of medium- and heavy-duty trucks for models made in 2019 and later.
| Feb 19, 2014
Net Positive Energy + Water is latest green certification standard
The advancement of sustainable construction has reached a new milestone with the development of Net Positive Energy+Water, a new green building certification standard that aims to improve net zero approaches to energy and water conservation.
| Feb 19, 2014
Obama’s climate resilience panel says PVs, cool roofs should be part of solution
Among the suggestions were rooftop solar energy systems and cool roofs, which could be encouraged by policies from local governments.
| Feb 19, 2014
OSHA proposes three-year postponement of crane operator certification requirement
OSHA’s proposal to postpone the compliance date for crane operator certification by three years was made official on Feb. 7 when it was published in the Federal Register.
| Feb 19, 2014
USGBC introduces new online educational platform
The U.S. Green Building Council has introduced “Education @USGBC” a new educational platform.
