Inputs

Existing fitting power W Enter a numeric project value in W at or above 0.1. Replacement fitting power W Enter a numeric project value in W at or above 0.1. 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. Existing control must dim the replacement Tick when this condition applies or the record is available. Replacement fitting is confirmed dimmable Tick when this condition applies or the record is available. Existing driver arrangement Choose the option that best matches the project condition. Replacement driver arrangement Choose the option that best matches the project condition. Ceiling access Choose the option that best matches the project condition.

Estimated power reduction -- %

Cut-out fits stated range --

Basic control compatibility --

Installation review required --

Calculation details

Estimated power reduction: -- %
Cut-out fits stated range: --
Basic control compatibility: --
Installation review required: --

Important notes

Compare lumen output, colour, beam, dimming range, driver location, thermal/insulation requirements, and fire or acoustic provisions, not power alone.
Electrical, fire, thermal, and Australian installation requirements require qualified review; this checker does not certify compliance.

Formulas

\(\displaystyle \mathrm{Power\ reduction} = \frac{P_{\mathrm{old}} - P_{\mathrm{new}}}{P_{\mathrm{old}}} \times 100\%\)
\(\displaystyle \mathrm{Fit} = D_{\min} \leq D_{\mathrm{existing}} \leq D_{\max}\)
Replacement suitability depends on the complete product, ceiling, control, thermal, and electrical context.

Check basic cut-out, dimming, and energy-use differences when replacing an existing downlight with an LED fitting.

Retrofit Downlight Swap Checker 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