LumenStream Secures £1.2M Investment Led by Clarendon Fund Managers
Deal News | Aug 19, 2025 | Clarendon Fund Managers Limited

LumenStream, an innovative provider of smart lighting solutions, has successfully raised £1.2 million in a funding round aimed at scaling its lighting-as-a-service operations. The round was led by a local angel investment syndicate, with significant participation from Co Fund III, managed by Clarendon Fund Managers, and Techstart Ventures. Known for its zero-upfront-cost smart lighting solutions, LumenStream helps businesses reduce CO2 emissions and operational expenses through its Pay as you Save model. The new capital will support the company's growth, including hiring in accounting, sales, and technical support as they prepare to expand their operations. High-profile clients like Siemens, Wickes, Oxfam, and Ryobi already benefit from LumenStream's services. Alistair Brown, CEO, emphasized the significance of this investment for LumenStream's mission to enhance energy efficiency in businesses, reinforcing Belfast's reputation in green innovation. This round marks an important step for Northern Ireland's green economy, providing sustainable economic solutions and reinforcing a commitment to reducing the carbon footprint.
Sectors
- Renewable Energy
- Private Equity & Venture Capital
- Technology
Geography
- Northern Ireland – The article emphasizes the role of LumenStream and this investment in Northern Ireland’s green economy.
Industry
- Renewable Energy – LumenStream provides smart lighting solutions to improve energy efficiency, central to the renewable energy sector.
- Private Equity & Venture Capital – Participation from Clarendon Fund Managers and Techstart Ventures highlights the significant role of private equity and venture capital in funding emerging green technologies.
- Technology – LumenStream's innovative smart lighting technology presents advancements within the broader technology industry.
Financials
- £1.2 million – Amount raised by LumenStream in the current funding round.
Participants
| Name | Role | Type | Description |
|---|---|---|---|
| LumenStream | Target Company | Company | LumenStream provides zero-upfront smart lighting solutions for businesses to improve energy efficiency and reduce costs. |
| Clarendon Fund Managers Limited | Lead Investor and Fund Manager of Co Fund III | Company | A private equity firm managing funds like Co Fund III, involved in supporting local high-growth businesses. |
| Techstart Ventures | Investor | Company | An investment entity supporting innovative and high-growth startups from inception. |
| Local Angel Investment Syndicate | Investor | Other | A group of angel investors providing financial resources to LumenStream. |