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 | Oct 26, 2018
Tall Mass Timber code proposals approved at Intl. Code Council public comment hearings
Proposals now go to online voting; final outcome expected in December.
Codes and Standards | Oct 25, 2018
Low-income neighborhoods could benefit most from green roofs
Those areas face the biggest risk from extreme heat.
Codes and Standards | Oct 24, 2018
Building design critical to prevent school shootings
Safety must be balanced with welcoming environment.
Codes and Standards | Oct 23, 2018
Codes in Florida Panhandle made buildings vulnerable to Hurricane Michael
Less stringent codes in northern parts of state linked to devastation.
Codes and Standards | Oct 19, 2018
Global Green Tag production certification standard will launch in U.S. at end of year
Australian program recognized by WELL, claims compliance with LE.
Codes and Standards | Oct 18, 2018
Federally-backed rebuilding of public buildings often leaves them vulnerable to future storms
FEMA dollars pay for reconstruction, but local decision-makers ignore climate change impacts.
Codes and Standards | Oct 17, 2018
Philadelphia plumbing code will now allow for more use of plastic pipes in high rises
Of the 50 largest U.S. cities, Philadelphia is one of just six that still require metal pipes.
Codes and Standards | Oct 16, 2018
New Disaster Recovery Reform Act will support adoption of updated building codes
Provides incentives for communities to modernize and enforce codes.
Codes and Standards | Oct 12, 2018
Boston ‘housing emergency’ prompts regional initiative for new residential construction
Mayors of 15 cities set goal of 185,000 new homes by 2030.
Codes and Standards | Oct 11, 2018
On-site staff key to energy benchmarking project for property management company
Manager training, data sharing are critical to meeting 20% utility cost reduction goal.
