You cut six neat holes in a bedroom ceiling for spotlights, wire them in, job done. Except that ceiling was a fire barrier between two flats, and you just put six gaps in it. That is the bit a standard downlight quietly ignores.

What does a fire-rated downlight actually do?

A recessed downlight needs a hole cut in the ceiling to sit in. That hole is a weak point. If the ceiling is part of a fire compartment, meaning it is meant to hold fire back for a set time, an open hole lets flame and smoke pass straight up into the void and on to the floor above. A fire-rated fitting closes that gap. Built into it is an intumescent pad, a material that expands rapidly when it gets hot and seals the aperture, so the ceiling keeps doing its job even with a light fitting cut into it.

The rating is measured in minutes. Fittings are tested to Approved Document B of the Building Regulations and to the BS 476 fire resistance standard, and rated at 30, 60 or 90 minutes. The number is not a quality grade you pick by preference. It has to match the fire resistance of the floor or ceiling it goes into.

Where fire-rated downlights are actually required

Not every ceiling is a fire compartment. In a single private house, a downlight in a ground-floor ceiling under a bedroom is usually going into a floor that has a degree of fire resistance, and building control will expect fire-rated fittings there too. In an HMO or a flat conversion, the requirement is far stricter, because the floors between separate dwellings and the ceilings on escape routes are rated compartments by law. Here is the quick read on when you must fit them.

If in doubt, treat any HMO ceiling as a compartment ceiling and spec fire-rated. It is a few pounds more per fitting against a failed inspection or, far worse, a breach of fire safety in a rented building.

How to choose the right fire-rated downlight

Once the fire rating is sorted, three things decide the fitting. First, the IP rating: IP20 is fine for a dry bedroom or landing, but a bathroom or shower room needs IP65 to handle moisture. Second, the ceiling void depth, because retro-fit jobs often have shallow voids and you need a low-profile fitting like the FType Mk2 that sits in the space you have. Third, the light output and colour temperature. A CCT-switchable fitting lets you set a warmer 3000K in bedrooms and a cooler 4000K in kitchens and bathrooms off the same stock item, which saves you holding several product lines.

Look for loop-in, loop-out terminals as well. They speed up wiring a run of downlights on a lighting circuit, which matters when you are fitting a dozen across a building. If you also need to cover escape-route lighting, that is a separate job with its own standard, and our range of emergency lighting covers the BS 5266 side of it.

For a broader look at how IP ratings map to rooms and zones, our guide on what IP rating your socket or switch needs runs through the same logic that applies to light fittings.

Frequently Asked Questions