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Description of offset function
e-Sense Actilume has a function that allows daylight adjust-
ment to be used effectively even for lighting located away from
natural daylight. The system has two control outputs (DALI 1
and DALI 2), which are connected to fixtures. Control output
DALI 1 is also called “Window” to indicate the placement of the
fixtures for this function, while DALI 2 “Corridor” is for lighting
further inside the space. The difference between the two is that
DALI 1 adjusts the level between the maximum and minimum
levels, around 100–3 %, and DALI 2 from 100–30 %. The offset
function also means that DALI 2 only begins to adjust when
DALI 1 has reached down to 70 %.
The effect of this function is to allow for the adjustment of
lighting that is normally ignored because the system is too
complex or the light level is wrong relative to the amount of
daylight.
See illustration below.
Example: Classroom
A normal classroom has a large window area along one of the
long walls. The lighting closest to the window is connected to
DALI 1 “Window” and is adjusted from 3–100%. The fixtures in
the centre and further inside the space are adjusted with an
offset of 30%, which compensates for the lower level of daylight
from the window. The result produces even lighting even though
the brightness is measured in line with the fixtures alongside the
window.
Example: Suspended fixture above the workspace
A suspended fixture divided into uplight and downlight is ideal
for use with the offset function. The uplight adjusts accor-
ding to DALI 2 and always provides more light upwards. The
downlight is adjusted according to personal settings between
3 and 100%. This produces a balance between personal light
and general light. If mode 2 is also used, the general light is
also extended within the space even if the person has left the
workspace.
Offset 30%
DALI 2 – Corridor
DALI 1 – Window
Ca 30%
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