A 90 mm ceiling cut-out can be difficult in retrofit projects because many modern LED downlights use different installation dimensions. Relighting.de helps identify whether a direct-fit luminaire, adapter ring or custom solution is realistic without unnecessary ceiling work. 90 mm is a common small-to-medium downlight size, but replacement products still vary in spring distance and visible trim.
The project request form is currently in German, but English project details and uploads are welcome.
Why a 90 mm cut-out should be checked first
In existing buildings, a few millimetres can decide whether the replacement luminaire covers the opening cleanly or leaves a visible shadow line. The cut-out should be checked together with trim diameter, mounting depth, ceiling material and control gear.
keep the existing ceiling appearance
avoid enlarging or repairing the ceiling opening
select matching light output, colour temperature and control type
reduce installation risk before ordering multiple luminaires
Photo upload helps the technical assessment
A photo of the old luminaire, the opened ceiling cut-out or the back of the fitting helps clarify spring position, driver space, mounting depth and the visible trim.
Frequently asked questions
Which LED downlight fits a 90 mm cut-out?
That depends on the luminaire cut-out range, trim diameter and ceiling build-up. Relighting.de checks whether a standard downlight, adapter ring or custom solution is suitable for 90 mm.
Do I need an adapter ring?
An adapter ring is useful when the new downlight is smaller than the existing opening or when the old cut edge needs to be covered cleanly.
Can the existing ceiling remain in place?
In many projects, yes. The goal is a replacement without large ceiling works. Special ceilings, fire protection or recessed cans should be checked before ordering.
Can I upload a photo of the old luminaire?
Yes. The request form allows a photo or PDF upload so the existing luminaire, cut-out and ceiling detail can be assessed faster.