Inputs

Existing cut-out diameter mm Enter a numeric project value in mm at or above 1. New fitting minimum cut-out mm Enter a numeric project value in mm at or above 1. New fitting maximum cut-out mm Enter a numeric project value in mm at or above 1. Fitting depth mm Enter a numeric project value in mm at or above 0. Available ceiling void depth mm Enter a numeric project value in mm at or above 0. Driver access Choose the option that best matches the project condition. Product data permits intended insulation contact Tick when this condition applies or the record is available.

Cut-out fits stated range --

Smallest cut-out margin -- mm

Fitting depth is within available void --

Basic installation checklist passes --

Calculation details

Cut-out fits stated range: --
Smallest cut-out margin: -- mm
Fitting depth is within available void: --
Basic installation checklist passes: --

Important notes

Confirm the exact cut-out tolerance, bezel coverage, ceiling thickness, driver location, insulation rules, and cable access with the product documentation.
Electrical, fire, thermal, and Australian installation requirements require qualified review; this planner does not certify compliance.

Formulas

\(\displaystyle \mathrm{Fit} = D_{\min} \leq D_{\mathrm{existing}} \leq D_{\max}\)
\(\displaystyle \mathrm{Depth\ check} = H_{\mathrm{fixture}} \leq H_{\mathrm{void}}\)
Fit and access flags are planning checks; the product datasheet and installer inspection remain authoritative.

Compare an existing downlight cut-out with a replacement fitting and flag basic access and depth checks.

Downlight Cut-out and Replacement Planner is a planning aid. Keep the target source, product data, measurement method, and project assumptions with the result. Confirm compliance, installation, certification, and safety decisions with the responsible professional.

Inputs

Results

Formulas