Title: Saving energy by relighting: a case study
Authors: De Taevernier, M
Leloup, Frédéric
Hanselaer, Peter
Belmans, Ronnie
Issue Date: Apr-2004
Host Document: Proceedings of Building performance congress, IEECB 2004 pages:7
Conference: Building performance congress location:Frankfurt am Main, Germany date:April 19-22, 2004
Abstract: A Belgian industrial lighting manufacturer develops efficient lighting fixtures with appropriate radiation
patterns using HID and fluorescent lamps. Regularly, this company is faced with the demand from the
commercial buildings sector (retail, clothing, furniture shops) to reduce the energy costs for lighting
while maintaining lighting comfort, aesthetics and colour rendering.
A grocery store with an area of approximately 1500 m² reports an overall power consumption due to
lighting of 47.3 kW (31.5 W/m²), general lighting being responsible for 65% and specific lighting
(poultry, vegetables, fresh meat, etc…) for the remaining 35%. High efficient fluorescent lamps (90
lm/W) without specific reflectors and with conventional gears are used. Power consumption of air
conditioning adds another 14.2 kW to the total power.
Three items to improve the energy efficiency of the lighting equipment are focused on:
(1) improvement of the light output of the fixture using high quality reflectors (2) substitution of
conventional gears by electronic gears (average power consumption of only 7% of the specific
installed power) and (3) introduction of HID lamps for the illumination of vegetables and meat.
As a result, the power installed for lighting is decreased by 40%. Another important saving is made
indirectly. A low power consumption generates also lower costs for air conditioning. A decrease of the
total annual energy consumption by 39% can be obtained, resulting in a pay back period of 3 years.
Furthermore, the colour appearance of the illuminated products is improved.
Description: Proceedings of Building performance congress, IEECB 2004
Publication status: published
KU Leuven publication type: IC
Appears in Collections:ESAT - ELECTA, Electrical Energy Computer Architectures
Informatics Section
Technologiecluster ESAT Elektrotechnische Engineering
Electrical Engineering (ESAT) TC, Technology Campuses Ghent and Aalst

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