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Abstract
The objectives of this work is to develop a task light for office lighting that fulfils the
minimum
requirements of
the European standard
EN12464
-
1
: Light and lighting
–
Lighting of work places, Part 1: Indoor workplaces
and
the Danish standard
DS
700
: Lys og belysning I arbejdsrum
,
or more specifically the requirements that
apply to the work area and the immediate
surrounding area.
By providing a
task light that fulfils the
requirements for task lighting and
the
immediate surrounding area, the general lighting only needs to provide
the
illuminance levels required for background lighting
and thereby a reduction in installed power for general
lighting of about 40
%
compared to the way illuminance levels are designed in an office environment
in
Denmark
today.
This
lighting
strategy
is useful when
the
placement of the
task area
is
not defined
in the
space
before the lighting
is
design
ed and
the strategy
also allows for
the task area
to be
redefined in the
space
. The
task lighting
follows the
task area as the developed task light is designed to be placed on the
desktop of an office desk.
The work
carried out
within this project is the
architectural
design
of the task light,
the
optical
design of the
light distribution, prototype
production
and
user tests for
comparison between the prototype and traditional
task lighting
luminaires.
The architectural design
and user friendliness of the task light was a high priority within the project in order to
promote market penetration of such a product.
The height of the lamp head is aligned with respect to
distribution and glare, which are two conflicting parameters. The broad distribution of the light requires a flat
lamp head with the light source close to the bottom edge, while the desire to minimize glare is met by raising
the lamp head and placing the light source as far from the bottom edge as possible.
The main results
of the project show opportunities for energy savings in an office environment by reducing
the installed power for the general lighting
by applying a task light with a wide light distribution across the
desk area
, providing high illuminance uniformity
. There is
still work to be done on the prototype to optimize
the energy consumption of the task light
and measures
need to be taken
to minimize glare
from the task light
as well as
reflected glare
.
The
lamp head
adjustment
possibilities regarding tilting
and turning result in
problems with glare and these adjustment possibilities should be eliminated in the final product.
In general,
the adjustment possibilities for height, length ways and sideways are important aspects for task lights,
however
they become less important when the light distribution is as wide as for th
e
prototype.
Using only
standard
components in the prototype, the optimal light distribution
for the purpose of meeting the
requirements
could not
be obtained
.
The light distribution was
approximated
to the requirements
by using
combinations of different beam shaping lenses. A final product would benefit from custom made lenses,
capable of providing the desired
light
distribution.
The user test shows that when working with general lighti
ng of 100 lx in the room the developed task lig
ht
with its wide light distribution
provides flexibility in choosing a reading task area on the desk and provides
more visibility to all objects on the desk than the two
traditional
reference
task lights
with
LED retrofit
light
bulbs
.
By utilising this new
type of
task light, the energy consumption by general lighting can be reduced by
approximately 40
%
by fully exploiting the
lower illuminance levels required by lighting standards for the
background
lighting. The
energy consumption of the task lights should be
optimized for a wide light
distribution while minimizing problems with glare.
Original language | English |
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Publication status | Published - 2014 |
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Fingerprint
Dive into the research topics of 'Energy Efficient Task Light: Final report for PSO 344-059'. Together they form a unique fingerprint.Projects
- 1 Finished
-
EDAL: Energieffektiv dynamisk arbejdslampe
Dam-Hansen, C. (Project Participant), Thorseth, A. (Project Participant) & Hansen, S. S. (Project Participant)
01/03/2012 → 30/04/2014
Project: Research