As part of its Climate Action Plan aiming for carbon neutrality by 2050, the Hong Kong Government embarked on a study to reduce light pollution, save energy, and improve people’s quality of life – all while preserving Hong Kong’s vibrant nightscape.
As the project’s lighting consultant, our team was at the heart of the challenge. We started by evaluating and selecting advanced technologies for measuring external lighting installations across the city, with a pilot study testing these technologies in real-world conditions. For example, we used a Hyperspectral Imaging System for large area, high-precision lighting measurement.
Overall, we measured lighting at 30 strategic locations in Hong Kong with 1000+ readings – not just once but at different times – to assess the current state of external lighting in the city and its impact on local communities. This included evaluating over 300 individual lighting installations, such as illuminated signage and outdoor video screens.
Our experts studied a range of areas to capture a whole range of different lighting environments and light pollution impacts – including busy tourist and commercial areas, mixed-use districts and local neighbourhoods.
The data revealed how light varies between locations – highlighting priority areas for reducing light pollution. For example, entertainment and commercial districts had some of the highest levels of light pollution – despite Hong Kong’s voluntary curfew encouraging non-essential external lighting installations to be switched off to minimize light nuisance after 10pm.
Alongside the findings, we also shared our recommendations for reducing light pollution with the Hong Kong Government, including tightening up regulations, using shielded fixtures, and switching to warmer-toned LEDs.
Thomas Li Tam, Senior Associate at WSP in Hong Kong concludes: “The project has set a new benchmark for urban lighting assessment in Hong Kong, combining technical innovation with practical recommendations to support responsible, energy-efficient lighting in the city.
“The insights empower decision-makers to make informed choices – enabling Hong Kong’s nightscape to stay vibrant, while reducing the impact of light pollution on people and wildlife.”
