Kirium Pro Mini luminaires, mounted on 4m columns, were selected for their ability to control light distribution, lighting the main car park. DfL worked closely with DW Windsor to create a bespoke luminaire shield which further reduced light spill for the west boundary to the site, ensuring light levels did not exceed 0.5 lux. Due to the sensitivity of the site and the need to minimise light spill at the boundaries, the area is lit to a P Class, rather than ‘recommended’ car park lighting levels. This deviation from the standard was subject to a risk assessment and is successful due to the low speed traffic flow.
Pharola DS (dark-sky) illuminated bollards, are additionally located on the access ramp, providing low levels of amenity lighting for pedestrians accessing the car park extension.
All luminaires feature PIR to dim the luminaires when not needed.
DfL specified warm white colour temperatures of 3000K/80Ra throughout the scheme - known for their lower blue light content than higher colour temperature sources - warmer colour temperatures are now recommended in the latest ILP guidance for Bats and Artificial Lighting in the UK.
It took nearly 12 years to develop and deliver an appropriate lighting strategy for this highly sensitive lighting scheme. The project opened in January, has since been awarded a prestigious ‘Good Lighting’ award by the Commission for Dark Skies.
The design achieved 0% upward light from the installation, which was one factor influencing the Commission for Dark Skies award.