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
Codes and Standards | Dec 15, 2016
OSHA releases safety recommendation guide for construction industry
It is said to be most helpful to small and mid-sized contractors.
Codes and Standards | Dec 14, 2016
Cities must invest $375 billion to avoid catastrophic global climate change
C40 Cities Climate Leadership Group advocates low carbon infrastructure.
Codes and Standards | Dec 14, 2016
Resilient construction techniques pay for themselves over lifetime of buildings
Spending $340,000 for resiliency would pay for itself over the lifetime of a $10 million structure.
Codes and Standards | Dec 12, 2016
Dept. of Energy launches program to advance zero energy school design
Six school districts and two states are among the first to mainstream zero energy schools.
Codes and Standards | Dec 9, 2016
California city’s plan for net zero building includes net zero water usage
Santa Monica city services building aims for highest level of sustainability.
Codes and Standards | Dec 8, 2016
WELL and BREEAM to align standards
The goal is to make it easier for projects pursuing both standards.
Codes and Standards | Dec 7, 2016
U.S. lumber industry pushes for import duties on Canadian softwood
The industry claims the product is being sold below fair market value.
Codes and Standards | Dec 5, 2016
International Construction Measurement Standards draft released
The goal is to improve consistency for calculating costs and reducing risk.
Codes and Standards | Dec 2, 2016
D.C. Council passes bill to reduce number of blighted properties
The new legislation reduces the amount of time a vacant property can qualify for a lower tax rate.
Codes and Standards | Dec 1, 2016
Passive House standard gaining influence in commercial sector
Some industry watchers predict it will become the base building code.
