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Chelsea & Westminster Hospital, UK

  • Chelsea & Westminster Hospital, UK
  • Chelsea & Westminster Hospital, UK
  • Chelsea & Westminster Hospital, UK
  • Lamp efficacy

    Lamp efficacy

    improved luminaire efficacy resulting in significant energy reduction.

  • Ballast classification

    Ballast classification

    Controlling the electricity supply to the lamp (Energy Efficiency Index).

  • Luminaire distribution

    Luminaire distribution

    Improved luminaire distribution resulting in greater luminaire spacings.

  • System efficacy

    System efficacy

    LED upgrade resulting in significant energy reduction.

  • Presence/absence detection

    Presence/absence detection

    Providing lighting only when it’s needed.

  • Daylight detection

    Daylight detection

    Reducing waste light during daylight hours.

  • Constant illuminance

    Constant illuminance

    Producing the correct lighting levels for the duration of the maintenance period.

  • Task-scene setting

    Task-scene setting

    Zoned lighting controls provide additional enargy savings

  • Timed off

    Timed off

    Automatic cut-off to turn all lights off during unoccupied hours.

  • Task lighting

    Task lighting

    Providing the required levels of light onto the task with minimal spill light reduces over-lighting of surrounding areas, providing the correct light levels to all areas whilst minimising energy use.

  • Zoning of lighting

    Zoning of lighting

    Zoning lighting in accordance to occupancy patterns or window location.

  • Maintenance schedule

    Maintenance schedule

    Tailoring maintenance schedules in accordance to product age, performance and environment.

  • Waste light

    Waste light

    Eliminating waste light which does not hit the intended target.

  • Reflectance


    Taking advantage of light which is reflected from the surface within the space.

  • Visible smart metering

    Visible smart metering

    Enabling results of actions to be quickly seen as increased or decreased energy use to encourage responsible energy consumption.

For the UK National Health Service (NHS), a sustainable health and care system that works within the available environmental and social resources is the key to protecting and improving health now and for future generations.

This means working to reduce carbon emissions, minimising waste and pollution, making the best use of scarce resources, building resilience to a changing climate and nurturing community strengths and assets. Chelsea and Westminster Hospital NHS Foundation Trust is one of many NHS facilities with a series of new build and refurbishment projects.

Lighting targeted for significant energy reduction
Supported by Ferguson Brown Consultants, Chelsea and Westminster obtained funding to upgrade to LED lighting based on predicted energy and CO2 reductions through the life of each installation. The need to replace existing fixtures point for point with minimal construction work was essential to the project as all areas were live environments so patient care and consideration was paramount.

Additionally, the timeline to design, manufacture and install a solution was a critical factor to be considered as deadlines were in place to access the funding of the project.

The right partners, solutions and commitment to excellence
Thorn were selected to provide the product solution based on a mix of standard, modified and bespoke fixtures, carefully selected to meet the stringent requirements of the project. Standard products included Chalice LED downlights for circulation areas, College LED for corridors and Omega LED for the patient wards. Local controls were also built into the project, helping to maximise the energy savings and provide additional functionality of the spaces.

Bespoke architectural solutions were used in more challenging areas such as the atria and staircases. The existing indirect reflector fixtures and suspended circular fixtures in these spaces were originally designed to complement the building architecture and are an important feature for the trust to keep and maintain the building identity. Therefore the refurbishment and upgrade exercise was required to replace the existing compact fluorescent sources with LED. With the timescales being so stringent on the project, the additional prototyping and testing of these bespoke solutions had to be built into the programme.

Setting the scene for the future
The upgrades completed in this phase of the project resulted in a 42% reduction in energy consumption with a payback of less than 5 years with the additional benefit of reduced maintenance not only a financial benefit for the Trust but also playing a major part in minimised disruption in the 24 hour care they provide and maximising safety through low maintenance lit environment.

Based on the success of this first phase, Chelsea and Westminster are now planning the remaining 60% of the refurbishment programme.