Downlights by Cut Out Size

Downlight cut-out sizes explained

Your cut-out size is the diameter of the hole in the ceiling (not the visible face of the downlight). If you’re replacing existing downlights, matching the cut-out size is the quickest way to upgrade without extra filling, patching or redecorating.

Most downlights are listed with:

Cut-out size (the hole size you need for replacing existing downlights)
Overall / bezel diameter (the visible outer edge)
Recess depth (how much space the fitting needs above the ceiling)

If you’re unsure, start with cut-out size first — then check bezel diameter and depth for the best fit.

How to measure your cut-out size (quick checklist)

Measure the diameter of the existing ceiling hole from edge to edge.
If there’s already a downlight fitted, measure the hole itself rather than the bezel/trim.
Measure in millimetres (mm) and note it down.

Tip: If your measurement sits between sizes, look for downlights with a cut-out range (e.g. “72–75mm”) or choose the closest match that comfortably covers the opening.

Cut-out size vs bezel size — what’s the difference?

It’s easy to mix these up:

Cut-out size: the size of the hole in the ceiling
Bezel / trim diameter: the size of the visible face that covers the hole
Depth: the space needed above the ceiling for the body of the fitting

If you have an older fitting, the bezel may be much larger than the cut-out. Always match the cut-out first, and then confirm the bezel will cover the hole neatly.

Common cut-out sizes (and where they’re used)

While every ceiling is different, these are popular sizes you’ll see in homes and refurb projects:

70–80mm cut-out: compact, neat look — common for modern LED upgrades
80–90mm cut-out: a flexible mid-size choice for general room lighting
90–100mm+ cut-out: often found in older installations or where a wider trim is needed

Use the size links above to shop the exact cut-out you need.

What if my hole is too big (or not a standard size)?

If your ceiling hole is slightly oversized, you still have options:

Choose a downlight with a wider bezel to cover the opening cleanly
Look for fittings with a cut-out tolerance/range rather than a single fixed measurement
For larger mismatches, consider solutions designed to cover and adapt existing cut-outs (such as hole converter plates)

The goal is a secure fit with a tidy finish — without creating extra ceiling work. You want to avoid having to re-plaster your ceiling.

Quick FAQ

Do I measure the hole or the downlight?
Measure the hole (cut-out). The downlight’s bezel is usually larger and won’t tell you the cut-out.

Is “cut-out size” the same as the downlight size?
Not always. The “size” people notice is the bezel/face, but the cut-out is what determines whether it fits your ceiling.

Can I replace a GU10 downlight with an integrated LED downlight?
Yes, certainly as long as the cut-out size and depth suit. Always check product specs before ordering or contact us for advice.

I’m not sure what I have — what should I do?
Start with the cut-out measurement, then check bezel diameter and depth. Or locate a data sheet to check the dimensions of your existing downlights. If you’re still unsure, send the size and a photo to our team and we’ll point you in the right direction.

Popular staff picks for existing hole sizes

If you already know your cut-out size, these are reliable starting points to consider:

From 25mm cut-out: Modulux Miniature Downlights
42mm cut-out: Ansell Prism Pro Mini
Around 60mm hole: Kosnic Erta II (58mm cut-out, often suits ~60mm holes depending on tolerance)
Around 70mm hole: JCC V50, Integral Evofire GU10, Collingwood H2 Lite 500

Need bathroom-friendly protection?

For moisture-prone areas, you may want an IP-rated option (e.g. IP65). Start with this filtered view: IP65 downlights for 91–120mm cut-outs.

Large holes made easy

If your cut-out is larger than expected or if your hole is damaged, choose a fitting designed to cover a wider range:

Integral EvoFire (70–100mm) — also available as an adjustable version (70–100mm)
JCC V50 Pro Retrofit (70–92mm)
For extra coverage, pair the JCC V50 with a concealer ring (covers 72–105mm cut-outs).

Also check ceiling depth

Alongside cut-out size, it’s worth checking the recess depth (how much space you have above the ceiling). If you have around 70mm ceiling space, start here: downlights up to 70mm depth.

Tip: GU10 downlights are often deeper than integrated LED downlights, so depth can be the deciding factor.

Ready to find your match?

Choose your cut-out size above to see downlights that fit your ceiling opening — then filter by finish, dimmable options, bathroom IP rating and more.

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