Circular Lighting Report

‘Bridgerton’ house reuses luminaires

Holburne Museum lighting

The Holburne Museum in Bath – well known as Lady Danbury’s house  in the Netflix series Bridgerton –  has reused and upgraded over 300 projector lights.

The halogen based lighting was based on MR7 spotlights from Stoane Lighting and were designed for use with 50W MR16 lamps.

To achieve the low lux levels required by certain artworks, the previous halogen MR16 lamp approach needed a significant warming of the light on the work.

Colour point stability through dimming with the new LED light sources allows the same light level to be used without significant shifts in the colour of the light.

The company agreed to remanufacture the lights, which were assessed under the CIBSE TM65  and found to have an embodied carbon of 34.3 KgCO2e.

The remanufacturing process saw the removal and recycling of some of the components and materials and their replacement with LED components such as an LED driver, new light source and optical elements.

Some 70 per cent of the original product, by weight, was maintained.

These new components add to the embodied carbon running total associated with lighting the Holburne museum. Using TM65 again the additional embodied carbon per luminaire equates to 11.7 KgCO2e.

Stoane says it’s impossible to say with certainty, given that new luminaires were not purchased, what the additional embodied carbon impact would have been but by comparing remanufacturing associated embodied carbon with a theoretical manufacture of an identical luminaire from scratch it estimates an embodied carbon saving of 23 KgCO2e.

On a project level that’s an embodied carbon saving of 6900 KgCO2e.

It was agreed that in order to minimise the museum down time the work should happen on-site. In the end the museum only closed completely for 2 days whilst work obscuring a stairway was carried out. For the remainder of the single week, on-site work was carried out by closing only single galleries at a time.

Stoane Lighting’s ReNew mobile workshop was parked up on-site with all tools, test equipment and three Stoane Lighting production engineers carried out 60 conversions each day.

The mobile workshop is setup to include a mirror of all Stoane Lighting tools, processes, electrical safety testing and quality systems.

On day one most of the gallery was still lit with halogen MR16, by the end of the week all of the MR7 had been converted.

• Remanufacturing Lighting is the subject of a special one-day conference organised by Recolight and taking place on Thursday 27 April 2023 at the Coin Street Conference Centre in London. This CPD-approved event will give you the tools, insights and contacts make a success of luminaire reconditioning and reuse. You’ll learn how to sell the concept of reconditioned lights, develop best practice policies, comply with the standards, set up a testing regime for reused luminaires and remanufacture fittings at scale. The gathering will also give you inspiration from real world projects which prove that remanufacturing can be a success everyone. You’ll also meet key players in the remanufacturing industry  network with specifiers with the power to get your products into projects. See more HERE.

Ray Molony

Recolight Report is an independent guide to the latest developments in sustainable and circular lighting. Learn about the people, products, projects and processes that are shaping our industry’s low carbon future. Plus: explainers on the latest innovations, opinion from thought leaders and video interviews with leading disruptors. Edited by lighting expert, editor and industry figure Ray Molony.