licht.wissen 19 No. "Impact of Light on Human Beings"

<strong>licht</strong>.<strong>wissen</strong> <strong>19</strong>
<strong>Impact</strong> <strong>of</strong> <strong>Light</strong> on Human Beings
The second variant (lighting concept B)
can take the form <strong>of</strong> “light showers”. which
have an energising effect and promote concentration.
Studies have shown that this
activating light delivers positive results in
schools. Because the high illuminance is
produced by only short bursts <strong>of</strong> power,
this is a very energy-efficient solution (see
also page 32f.).
<strong>Light</strong>ing concept B:
Activation
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illuminance
colour temperature
© <strong>licht</strong>.de
With both concepts, the following should
be noted: activating light is advisable only
during the day; it should not interfere with
valuable night-time rest. In the evening,
warm light colours (up to 3,300 kelvin) are
recommended in combination with low
illuminance. Evening light should also be
directional to minimise stimulation <strong>of</strong> the
melanopsin-containing photoreceptors in
the eye. With the right choice <strong>of</strong> luminaires
and light sources, lighting can be regulated
to suit the time <strong>of</strong> day.
Suitable luminaires and light sources
The lighting industry today markets
numerous luminaires designed to <strong>of</strong>fer a
combination <strong>of</strong> different light colours and
deliver both direct and indirect light. Colour
temperature and light incidence can thus
be varied over the course <strong>of</strong> the day. The
use <strong>of</strong> different luminaires is a good alter -
native, e.g. a combination <strong>of</strong> luminous
ceiling elements that cast cool white light
into the room over a large area and directional
spots or task luminaires that provide
non-activating lighting in the evening.
Initially, the only light sources where it was
technically possible to add the increased
blue content needed to address the third
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