Is this the end for GU10 LED lamps? Let’s hope so… The 2026 edition of Approved Document L, Volume 1 has now been published and there’s an interesting change for lighting. For new and existing dwellings, internal luminaires should have light sources achieving a minimum luminous efficacy of 105 light-source lumens per circuit-watt, subject to the provisions for specialist light sources. So, what could this mean for the humble GU10 LED lamp? Many GU10 LED lamps currently on the

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