LIGHTING SPECIAL GALLERY CASE STUDY
Daylight maps for the pre-1900 gallery under various skylight configurations
HEPWORTH GALLERY TEAM
Project: The £35 million Hepworth Wakefield art gallery houses 44 Barbara Hepworth sculptures and the work of other local artists. The building is sited on the headland of the River Calder at the southern gateway to the city, and comprises a cluster of 10 trapezoidal blocks of different sizes, which form the display spaces. All the galleries are on the upper level and have natural lighting.
Lighting Design (DayLight anD eLectric): Arup Lighting
architect: David Chipperfield Architects
Lighting suPPLiers: Zumtobel (Arcos spots with customised lenses); Viabizzuno (094 system customised to provide integrated lighting and ventilation solution on ground floor)
the galleries create visual connections for gallery visitors to the river and surrounding landscape, while allowing people outside to get glimpses of activity inside and of collections on display. The windows use transparent glazing with a clear UV interlayer to protect sensitive works. Open- weaved diffusing blinds of 20% lighting transmittance are deployed on sunny days, still maintaining the view outside. When the exhibition is closed, blackout blinds cut out unnecessary light exposure. The visitor experience is further
enhanced by the play of light in the galleries. At the taller end of each gallery, discreet skylights create a daylit backdrop, providing a ‘stage’ for the exhibition. The skylights use laminated glass with a diffusing interlayer that doubles as a UV filter. Adjustable louvres control daylight filtering through the skylights, creating a glow at the top of the wall to draw the eye of visitors entering the room. These are adjusted seasonally, modulating higher light levels between March and November, while maintaining the experience of external lighting variation throughout the day.
Electric lighting in the galleries comprises two lighting elements: concealed cove lighting and track lighting. As daylight fades at dusk, each skylight is subtly illuminated with concealed T5 HO fluorescent luminaires, fitted with asymmetric reflectors to provide ambient lighting after dark. In addition, track
40 CIBSE Journal December 2011
lighting is provided to accommodate any art location or wall configuration, allowing for flexibility in illuminating artwork displays. The sloped ceiling posed a challenge as
it was problematic to design a recessed track layout that could ensure uniform wallwashing and optimum incident lighting angles on wall-hung artwork. Zumtobel’s Arcos IRC tungsten halogen wallwashers with a special sculptural lens were specified to overcome this. A light- reduction lens was added to reduce light output, while keeping the colour at the correct temperature to harmonise the cool daylight temperatures at one end with the warm (3,000K) tungsten halogen. Arup adopted a minimalist approach to
the ground-floor lighting with Viabizzuno’s 094 system, customised to provide an integrated lighting and ventilation solution. Cool white T5 HO lamps create crisp runs of parallel light lines across the ceiling for the entrance reception lobby, bookshop and café. The completed building, winner of
a British Design Award 2011, has had an enthusiastic response from public and critics alike. In particular, The Independent newspaper has described the galleries as ‘sublime spaces’ and The Hepworth Wakefield as ‘one of the finest contemporary art museums in Europe’.
l Florence lam is global practice leader for lighting design at Arup.
www.arup.com/lighting
www.cibsejournal.com
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