27
Visual vs. non-visual
effect of light
• Recalibrate your body clock (morning) and hormones.
• Triggered by exposure to daylight
• It’s based on vertical illumination at eye level
Melanopic effect is influenced by:
• Stimuli duration (4 hours)
• Higher light intensity (and energy consumption) or
• Colour spectrum (Shift of colour temperature to cold light
or cyan enhanced spectrum)
• The ability to see
• Indoor lux levels are generally tuned to the visual function
of light (500 lux), which will not trigger the melanopic effect
Melanopic component
The non-visual, biological effect of light
Photopic component
The visual effect of light
1 0 0 %
8 0 %
6 0 %
4 0 %
2 0 %
4 0 0
4 5 0
0 %
5 0 0
5 5 0
6 0 0
6 5 0
7 0 0
S P E C I A L P O W E R D I S T R I B U T I O N
C ( λ )
V ( λ )
1 0 0 %
8 0 %
6 0 %
4 0 %
2 0 %
4 0 0
4 5 0
0 %
5 0 0
5 5 0
6 0 0
6 5 0
7 0 0
S P E C I A L P O W E R D I S T R I B U T I O N
C ( λ )
V ( λ )
Figure 1.3.3 Circadian (C(λ)) and visual (V (λ)) systems’ response to light (Pechacek et al., 2008).
L I G H T & W E L L - B E I N G
01
02
03
04
