Circular Lighting Report

Street light achieves record TM66 rating of 3.1

TRT Oaken

A street light whose housing is made from European Oak has achieved a record 3.1 rating under the Cibse circularity measure, TM66.

The Oaken, manufactured by Thorlux Road and Tunnel (TRT), was assessed by the Lighting Industry Assocation’s Product Verification scheme and is believed to be its highest ever score.

The body is crafted from strips of laminate oak which has been sustainably harvested from a PEFC certified forest. TRT says that the wood used in assembling the structure will be stable and resistant to warping or twisting due to the lamination of kiln-dried oak planks. This stability is achieved through the design and the choice of wood type and drying process.

The wood has also been 650oC and 850oC hot-wire tested. TRT says it can withstand exposure to extreme weather conditions and will achieve a life in excess of 20 years.

As well as the wood body, the unpainted gear tray and the mounting post are both made from 90 per cent recycled aluminium sheet. The IP66 gear enclosure is made in the UK from 100 per cent post-industrial polycarbonate.

The LED module has an efficacy of 191.7 lumens per Watt and is matched with highly efficient PMMA and polycarbonate lenses.

The driver has an efficiency of up to 92 per cent and incorporates two possible DC current output channels. These channels allow the product’s chosen power rating to be selected during manufacture, from two options that

more closely match optimum conditions. Driver efficiency is therefore closer to the maximum of 92 per cent as opposed to less optimal drivers, having only one channel option, achieving only 85 per cent, says TRT.

The Oaken is also available with the TRT PowerSet integral power output selection device, enabling on site adjustment. Using an NFC remote

control, you have the ability to scan a QR code specifying your preferred wattage. By directing the remote towards the wooden housing, and the

radio signals transmit through with ease, negating the need to open the lantern.

There is a 97 per cent reduction in embodied carbon by using oak housing vs aluminium cast alloy body. For the whole luminaire, there’s a 50 per cent reduction in embodied carbon compared to a standard fitting. TRT also points out many of the components are highly recyclable at the end of the luminaire’s life. TRT also points out many of the components are highly recyclable at the end of the luminaire’s life.

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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.