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BNP Paribas Fortis - LINGOT = LightING On Telephone

Added on 22-03-2013


BNP Paribas Fortis



Business challenge

BNP Paribas Fortis continuously makes efforts to reduce his carbon footprint and energy consumption. As lighting is a major consumer in our corporate buildings, we investigated possibilities to reduce automatic lighting timing and to work more demand-driven, in particular in existing buildings.

Also one central calendar was put in place for the light control, facilitating the management, (bank-holidays, week-ends etc ). The fact that some of our buildings are rented, was an additionally challenge and asked for an easily feasible solution to be integrated in the Building Management System, guaranteeing the same of level of comfort to the building users. The threshold to use Lingot should be low, maximizing the impact.


At the start of the project, lighting was on in the complete building from 6 am until 22 pm. Thanks to Lingot standard lighting timing could be reduced with 5.5 hours, from 7.30 am until 17h30 pm. Additionally holidays could be programmed as well, avoiding any manual interventions.

As the major part of office buildings do not have switches, for public use, to control the light. A solution was adopted to control the light without the need to add wiring (high investment!) The used of the pushbuttons of the telephone, where used instead. The constraint is, that there must be a building management system available.

Besides the standard lighting timing, a user that wishes to occupy a local, could call a central number. A vocal server will guide him, based on the telephone number. Building and location are determined by the system. Through questions and answers the lighting can be activated during a period of time in the location that he wants. The selected criteria’s will transmit a command to the Building management control software, providing the localization, duration and other information required to manage correctly the request. 10 minutes prior to the end of the requested cycles, the server will call the request location source, and inform the period that’s left. The user can extend the duration or cancel it.

The implementation process was mainly conducted by technical managers and the building managers of the tested buildings. An information campaign was organized to inform building users of the new system.

Challenges/Lessons learned:

Yearly energy savings of approximately 300.000€ resulted in a return of investment of less than one year.

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