matically for the first lesson of the day in
each classroom. The intent is to adjust the
circadian rhythm of the students first thing
in the morning.
The installation of the system was in
part based on work done at the Norwegian
Competence Center for Sleep Disorders at
Haukeland University Hospital. University
researcher Ingvild West Saxvig said, “During
puberty, the sleep pattern often shifts
towards later bedtime and awakening. This
may reduce the performance among adoles-
cents and adults.”
The HCL implementation is intended to help
prevent delayed sleep-wake cycles among the
students. The cool to cold lighting presum-
ably pushes the circadian rhythm forward to
improve alertness and also makes the students
sleepy at the appropriate time at night.
At the first break of the learning day, the
BMS automatically transitions the lighting to the Standard setting. The change is
not accomplished immediately. Instead, the
system is programmed to gradually change
over a 10-minute period so that students and
teachers don’t even notice the transition.
Still, the teacher can take advantage of the
cooler light by selecting the Focus setting
from the control panel on an ad hoc basis.
That setting would typically be applied
during tests or for other lessons where acute
focus is required. When the Focus setting is
deselected, the lighting gradually transi-
tions back to Standard.
Meanwhile, the Calm setting is warmer
than Standard. The CCT is a warm 2700K
with horizontal illuminance maintained at
300 lx on desks. Teachers select the Calm setting for periods of relaxation or calm activities. The BMS is also programmed to deactivate both Focus and Calm settings after
30 minutes in case teachers forget to do so.
After such a period, the lighting returns to
a standard setting.
The concept behind the HCL implementa-
tion is simplicity for teachers that may not
understand the deep science behind tun-
able lighting. In fact, we have seen similar
implementations from other lighting man-
ufacturers. Acuity Brands, for instance, has
preconfigured modes in its Mainstream
Dynamic product lines intended specifi-
cally for educational environments (http://
Other SSL for the school
The Holla project, as mentioned at the start,
was a comprehensive LED project. The specifiers also used the CR15-R square troffer in
some areas where tunable capabilities were
not required (Fig. 2). Other indoor areas are lit
with Reed LED linear pendant-style fixtures
such as to light the presentation boards in
classrooms, as you can see in Fig. 1.
Outdoors, O50 LED floodlights in a cobra-head style illuminate parking and pedestrian areas. In addition, decorative O46
post-top luminaires are used in some outdoor recreational areas (Fig. 3).
HCL remains a hot and somewhat controversial topic around the globe. Some scientists believe that we don’t understand
enough about the non-visual impact of
light to deploy HCL concepts, while others
think we should move forward with what is
known. We published an editorial on that
topic last year that also links to a number of
other HCL articles that we have published
( http://bit.ly/2mBgiA7). FIG. 2. Recreational areas and hallways are lit with fixed-CCT troffer products.
FIG. 3. The outdoor lighting includes both decorative post-top luminaires and parking-area fixtures in the cobra-head format.