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|Schöfferstrasse 1, Darmstadt - Germany|
|Lengfeld + Wilisch, Prof. Mathias Lengfeld|
|o-pium ltd. - Stephan Horn, London - UK & Wiesbaden - Germany|
|DALI EASY II/230 FS1 OSRAM|
EASY PB COUPLER FS1 OSRAM
EASY IR CI FS1 OSRAM
DALI EASY RMC FS1 OSRAM
|o-pium - office for postindustrial urban matters ltd.|
The Faculty of Architecture at the University of Applied Sciences, Darmstadt, Germany, is seated in a beautiful „modern style“ atrium building.
Like most of the original modern style buildings it finally needs to be refurbished in these days.
The refurbishments are proceeding parallel, during the faculty activities.
Complex interventions can only be undertaken during the closedowns between semesters.
In 2008 the two main auditoriums were refurbished. The entire space is about 13,00 m long and 1,50 m wide. Due to the rising seating the room is from 6.00 m to 3,00 m high.
The refurbishment is thought as a sensitive intervention on the generic architecture. Part of the intervention is a new acoustic and light ceiling. This ceiling needs to meet the high claims to represent an Architecture Faculty of an University. It was designed as a series of wave like curved unique elements on the ceiling. Every element is hiding the fittings that are directed versus the anterior one. The main goal became to realize the aesthetical vision with the clear objective of a light-acoustic ceiling that distributes light only indirect. This, of course taking into consideration all the appropriate standards, but focused especially on sustainability requirements.
The current state of technology requires for a lecture hall (auditorium) of this size and shape with rising seating rows and a maximum room height of 6,00 m in any case direct lighting, because you can’t achieve the required lux-levels (500 lux) all over the space with today available indirect luminaires. Direct light is therefore rather necessary.
Due to latest scientific discoveries the application of standards can be discussed with serious arguments:
The newly discovered third retinal photoreceptors, that are suppressing the melatonin and because of their spectral sensitivity, allow to create either effective either energy-saving light sources as well as light applications. The individual visual needs and further meeting the requirements of visual functions can successfully be taken into consideration.
Lighting Concept |
This lighting design is based on the results of a study by the U.S. Department of Energy: “Energy Efficiency and Renewable Energy to "Spectrally Enhanced Lighting" (SEL)”, which is about to transfer the above-described attemption into practical application and to examine the results of energy savings.
Based on their studies it is possible to reduce the initial value of 500 lux using standard lamps of a colour rendering greater than 70 and a colour temperature of 3500 Kelvin to approximately 360 (!) lux by using lamps with a colour rendering higher than 80 at a colour temperature of 5000 Kelvin. The physiologically perceived brightness is the same. Studies of the Technical University Illmenau, Germany and of the Technical University Darmstadt, Germany conclude similar.
Regarding the light distribution, the use of indirect light on such a huge surface creates an incredible uniformity, which is an additional positive aspect.
Today an state of the art appropriate lighting scheme using the minimum of direct light to fulfil the requirements and using the sustainable technology, which is a fluorescent tube or a compact fluorescent lamp, already reaches a low value of energy consumption of approximately 3240 watts = 3.2 KW per hour at full load without dimmed areas and zones (considering the ballast’s consumption as well).
The solution realized in Darmstadt provides only indirect light.
Here we end up with 30 55W compact fluorescent lamps and a value of energy consumption of 1830 watts = 1.8 KW per hour by full load without dimmed areas and zones (considering the ballast’s consumption as well). That is slightly more than half of the consumption of today's state of the art solutions fulfilling the required standards.
An 850 compact fluorescent lamp (TCL) is currently not available. Such a lamp already exists as fluorescent tube. Until the lamp will be on the market, the auditoriums is lit with TCL 840-55 W lamps.
Light Control Concept |
The DALI controlled luminaires are taken of a standard product range equipped with OSRAM DALI ballasts and the required reflector is assembled with a 55 W compact fluorescent lamp. DALI allows to program intelligent presets of the current state of technology after the completed installation of all components, taking into account the daylight and to dim the luminaries that are close to windows, as well as the building of groups of luminaires that distribute the same lux levels at different heights of the space. With the OSRAM DALI easy control it was possible to integrate the auditoriums into the superordinated EIB control system. The DALI system allows to consider all kinds of scenes, such as presentation, exams, lectures, etc. and to get an easy controllable space. All this minimizes the consumption and maximizes the energy savings while forming an atmospheric spatial situation by lighting, and supporting again the desired efficiency with so-called perceived quality of light.
On Monday, 16 April, three winning projects were selected for the DALI Award 2012.
See the Winner of the DALI Award 2012.