Low Daylight Level; Switch-On/Off Sequence; Daylight Harvesting - Philips EasySense Design Manual

Switch-on/off sequence

If occupancy is detected, lights are dimmed up to
the switch-on light level in 0.7 second.
When occupancy is not detected anymore, the
following lighting switch-off sequence is executed:
the sensor will wait until the hold time is expired and
then the light fades the background level in grace
fading time. The light level is kept on the background
level for prolong time. After prolong time expires,
the light fades from the background level to off
in 0.7 second.
Occupancy-based lighting control is enabled by
default for the EasySense, and it can be
disabled using an app through NFC.

Low daylight level

Figure 6. Lighting control behavior with low daylight level.
May 2016

Daylight harvesting

Daylight-based control is enabled by default.
The light sensor auto-calibrates when power to the
driver is cycled. The light level of the luminaire is
bounded by field task level (maximum light level)
and background level (minimum light level). If the
background light level is set to be 20%, during
daylight harvesting, the light will only dim to 20%.
Daylight-based control is not active after hold time
of the occupancy sensor expires.
Figures 6 and 7 show examples of lighting control
using both daylight and occupancy. When the
daylight level is low (Figure 6) and an occupant is
present, the luminaire light level is the field task
level minus the daylight level. Assume the incoming
daylight level is constant, luminaire light level
remains the same until hold time expires, then it will
fall to the background light level. When the daylight
level is high, the luminaire light level is the field task
level minus the daylight level. However, when there
is an abundance of daylight, the luminaire light level
does not dim lower than the background light level
(Figure 7).
Background light level
Field task level
Daylight level
Occupancy level
Light level of the luminaire
Light level of the luminaire = Field task level - daylight level
Design-in Guide - Philips EasySense luminaire-mount sensors 11