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WW22189_ASID.March.2016.indd 1 1/27/16 1:28PM
illuminance and light emittance] levels, the light with more short-wavelength
content will typically be better at suppressing melatonin than the light that
has less short-wavelength content,” says Figueiro.
LIGHTING THE WAY
To help designers think beyond visual lux, the WELL standard uses a measurement called Equivalent Melanopic Lux (EML) to describe “circadian
light.” It provides formulas to calculate EML for light sources at different
color temperatures; for example, a 2,800K incandescent provides roughly
the same EML as a 4,000K fluorescent.
Circadian lighting calls for a boost of blue-rich light during the daylight
hours to help bolster the body’s circadian rhythm. For instance, the WELL
standard calls for 250 melanopic lux for at least 75 percent of workstations
for a minimum of four hours during the day.
Daylighting a space is an obvious first step before supplementing with
artificial light. “You want to provide circadian stimulation in a cafeteria
where people naturally gather in the morning, and at every desk space,”
says Figueiro. Recognizing that extremely “cool” lights can appear institutional, she notes that it’s possible to get LEDs with SPDs that look warmer
4. A comparison
of the spectral
of a typical LED,
shows that even
though the resulting
output may look
similar to the eye,
have much more
5. The Cypress Cove
memory care facility
in Fort Myers, Florida,
changes its lighting
from cool, high levels
during the day to
warm, low levels in
the evening to support
the health of its elderly
SOURCE: © 2016 MOLECULAR VISION
POWER SPECTRUMS OF DIFFERENT LIGHT SOURCES
380 420 460 500 540 580 620 660 700 740 780
White LED Fluorescent Incandescent