Municipalities, like Seattle, have been changing the streetlights to LED. There are still high-pressure sodium source fixtures around, but gradually it is presumed that those will all change to LED as well. What do we think about the new nighttime environment? Do you like the cool, blue wash emanating from the streetlight on your block? Or maybe you live in more of a commercial district, and the lighting includes pedestrian-scale luminaires that may be warmer? Or, perhaps there is still a high-pressure sodium floodlight washing a parking lot near where you live? In Seattle, there is a push to change all the residential streetlights to 3000K instead of 4000K Correlated Color Temperature (CCT). The change hasn’t happened yet, but we’re told that it will. The rationale from the utility is their need to respond to customer complaints, and the impact of the American Medical Association (AMA) Report, which the IES disputed. Is this the right move? Do we really want warm, electric lighting bathing the nightscape outside our homes?
Health, Safety and Welfare
Learn about the AMA report, and the IES rebuttal that followed.
Review the common criticisms of LED fixtures.
Review the latest science-based findings.
Assess the design implications of warm light everywhere.
CJ Brockway, IALD, Principal, SparkLab Lighting Design
LEDSS WA S5