A new downlight from Thorlux has scored the highest for circularity in its product class.
The G3 Evo achieves 2.9 on Cibse’s circularity metric TM66, putting it in the ‘excellent’ category. The score was independently verified by Lighting Industry Assocation’s laboratories.
The luminaire has efficacies of over 150 luminaire lumens per circuit Watt and uses 52 per cent recycled material.
Available with black or white reflectors, the range offers both IP40 and impact-rated IP66/IK10 versions.
An innovative integral sensor options mean Thorlux’s proprietary SmartScan wireless technology is available across all models, delivering advanced lighting control.
The company says it is dedicated to the principles of the circular economy and designs all new products guided by the TM66 framework. This encompasses material selection, performance optimisation, recyclability, and more.
TM66, a ‘technical memorandum’, was introduced by Cibse’s Society of Light and Lighting in 2021.
The metric, which measures the circular performance of luminaire, has been in a preliminary ‘beta mode’ since its introduction.
Now the TM66 development team, the founding partners and parallel organisations are working on the official first version of the standard.
Sections of the document likely to change include:
• Materiality, the identification and appropriately scoring of those aspects of a luminaire’s design, materials, construction or ecosystem that have the most impact on circularity
• Precision and transparency, especially related to language, reporting and evidence
• Greenwashing, the reduction of the possibilities of the metric being used to make misleading or false claims about the environmental benefits of a light fitting.
TM66 won a prestigious Build Back Better Award on its publication on its publication in 2021 and was quickly adopted by the lighting industry.
Major lighting design practices and organisations are using the metric in their procurement and specification policies, and many manufacturers have rated their luminaires on the TM66 scale, which gives a number between 1 and 4 similar to a vehicle’s NCAP safety rating.
Last year, Thorlux’s pendant, the Strike M, achieved a 2.5 ‘excellent’ score in TM66.
• See more innovations in sustainable lighting at Circular Lighting Live 2026, Recolight’s flagship conference and exhibition, which takes place on Thursday 8 October 2026 at the Minster Building in the City of London. Free to specifiers, Circular Lighting Live 2026 will feature leading experts, specifiers and policy makers who will share their insights into forthcoming standards and legislation, emerging technologies and new business models. More info: www.circularlighting.live
