Mains voltage downlights are recessed ceiling lights that operate directly on the main electrical supply voltage (230V in the UK), without needing a transformer.

Mains voltage downlights run directly on the household mains electricity supply (230V), while low voltage downlights (typically 12V) require a transformer to step down the voltage.

Mains voltage downlights are simpler to install as they do not require a transformer, tend to have a longer lifespan due to fewer components, and can be more cost-effective overall.

Mains voltage downlights commonly use GU10 bulbs, available in halogen or LED versions. LED GU10 bulbs are preferred due to their energy efficiency and longer lifespan.

For bathroom use, downlights should have an IP rating appropriate for the zone they are installed in. Typically, an IP44 rating is sufficient for zones 1 and 2, while IP65 or higher is recommended for areas directly exposed to water jets.