Siemens Desigo TRA Engineering, Mounting And Installation Manual page 69

Definition: Illuminance
Minimum room
conditions
Note
Siemens
Building Technologies
Brightness refers to how the human eye perceives the intensity of a light source.
Brightness is measured in Lux [lx]. The human eye can perceive various light
sources with the same brightness. Depending on the technology, solar cells have
varying degrees of efficiency for daylight and artificial light. Fluorescent lights
require at least 30% greater brightness to generate the same level of charging as
daylight.
The value of the product light (Lux) and duration (h) are referred to as Lux h.
The amount of available daylight in the winter is minimal. Winter must be used for
calculations if the intent is to guarantee functionality. Of further note is that
illuminance differs on horizontal versus vertical surfaces. As a matter of principle,
horizontal surfaces are better then vertical, of course with the exception of roofs.
The following minimum conditions must be guaranteed for the mounting location of
STM solar cells:
Check the STM initialization parameters as described in the user's guide.
Check light sources (daylight or artificial light). Assume a worst case involving
fluorescent lamps if the light source cannot be clearly defined.
Define minimum brightness and duration of illuminance required to ensure
operation.
Check lighting conditions on the planned mounting location for the module
assuming the least favorable conditions (e.g. in winter).
The energy cell drains too much if the average illuminance drops below the
defined, indicated values and transmission ceases. Transmissions resumes
automatically as soon as the energy cell is sufficiently charged.
The list provides typical illuminance values. Please use a Lux meter to measure
actual values.
A satisfactory Luxmeter is available as of EUR 30.
Building type
Apartments
Schools
Offices
production
Hospitals
Hotels
Desigo TRA Engineering, mounting and installation
EnOcean RF networks
Room type
Normally
Hallway
Class rooms in general
Reading rooms, labs
PC rooms, working on PCs
Meeting rooms
Cafeteria
Hallways
Reception area
Bathrooms
Manufacturing halls
Development, office
Design CAD
Labs and inspections
Product packaging
Storage
Visitor rooms
First aide, surgery
Patient rooms
Pharmacies
Laundry rooms
Reception area
Reception areas
Typical brightness
100 - 500 lx
100 - 300 lx.
300 - 750 lx.
500 - 1500 lx.
200 - 500 lx.
300 - 700 lx.
150 - 300 lx.
50 - 100 lx.
300 - 700 lx.
100 - 300 lx.
500 - 1500 lx.
300 - 750 lx.
500 - 1500 lx.
750 - 1500 lx.
150 - 500 lx.
100 - 300 lx.
300 - 500 lx.
500 - 1500 lx.
100 - 300 lx.
500 - 1000 lx.
150 - 300 lx.
200 - 500 lx.
100 - 300 lx.
69 / 84
CM111043en_09
2016-02-22