TM66: What’s in the next version?

Kristina Allison SLL

TM66, which measures the circular performance of luminaire, has been in a preliminary ‘beta mode’ since its introduction since 2021.

A full version is now being developed by Cibse’s Society of Light and Lighting with changes expected in materiality, language and its ability to be used in greenwash.

At Circular Lighting Live 2025, TM66 co-author Kristina Allison CEng FSLL MCIBSE will update the industry on the development of Version 1 and give key insights into how manufacturers can design luminaires for high ratings.

Allison is one of 35 expert speakers brought together for one day only for Circular Lighting Live 2025.

Organised by Recolight, this one-day conference and exhibition on Thursday 25 September at the Minster Building in London will put you ahead of the biggest trends in the lighting sector.

Adding to the mix is a series of inspirational ‘Just One Thing’ micro talks, the presentation ceremony of the prestigious Build Back Better Awards and debates on key issues affecting the lighting community.

Standby too for the unveiling of radical new initiatives and business models to tackle some of big environmental challenges facing the industry.

Big brands backing the event include Signify, Sylvania Group, Glamox, KKDC, Prime Light | Group, Prolojik Limited, Thorlux Lighting, Trojan Lighting Solutions Limited, NVC Lighting UK, Mymesh by Chess UK, SMART SYSTEMS UK LIMITED and ALBIS Distribution.

Attendance is free for specifiers such as lighting designers, consulting engineers and architects. Link in the comments.