LumenStream Climate Tech Company Raises £1.2M To Scale Lighting As A Service

The round was led by a local angel syndicate, with strong backing from Co Fund III (managed by Clarendon Fund Managers) and early investor Techstart Ventures.

The funding will help LumenStream scale its zero-upfront-cost smart lighting solutions, allowing high-energy users to cut CO2 emissions and lower costs. Its "Pay as you Save" model delivers instant savings with no upfront investment.

Alistair Brown, CEO of LumenStream, shared: This £1.2m investment marks a pivotal moment for LumenStream. We are incredibly grateful for the continued trust and support from our investors. This funding will accelerate our mission to make energy efficiency the ‘first fuel’ for businesses expanding our reach and reinforcing Belfast’s position at the forefront of green innovation.

Jonny Barr representing the local angel syndicate shared that their investment in LumenStream highlights their strong commitment to building a more sustainable future.

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LumenStream’s proven model provides a tangible and immediate solution for businesses to reduce their carbon footprint and achieve significant energy savings. We are proud to partner with a company driving such critical environmental and economic impact.

Sian McLaughlin, Senior Investment Manager at Clarendon Fund Managers, said LumenStream is exactly the kind of innovative, high-growth tech company they’re proud to support in Northern Ireland.

Their ‘Lighting as a Service’ model is not only commercially astute but also fundamentally contributes to a greener economy.

LumenStream has already attracted major clients like Siemens, Wickes, Oxfam, and Ryobi. The company is now growing its team hiring for positions in accounting, sales, and technical support.

This investment reflects the growing strength of Northern Ireland’s green economy and LumenStream’s role in delivering practical, high-impact solutions for a more sustainable future.

About LumenStream

Founded in 2018 LumenStream helps businesses save money and cut unnecessary carbon emissions through energy efficiency. The company offers a simple solution with its “Lighting as a Service” model making it easy for businesses to switch to sustainable lighting without upfront costs. LumenStream’s mission is to support a cleaner greener future by helping companies reduce energy use and environmental impact while improving their bottom line.