Inputs

Downlight count Enter a numeric project value at or above 1. Existing watts per downlight W Enter a numeric project value in W at or above 0.1. New watts per downlight W Enter a numeric project value in W at or above 0.1. Operating hours per day h/day Enter a numeric project value in h/day between 0 and 24. Operating days per year days/year Enter a numeric project value in days/year between 0 and 366. Energy tariff $/kWh Enter a numeric project value in $/kWh at or above 0. Existing cut-out diameter mm Enter a numeric project value in mm at or above 1. Replacement minimum cut-out mm Enter a numeric project value in mm at or above 1. Replacement maximum cut-out mm Enter a numeric project value in mm at or above 1. Existing controls must dim replacement Tick when this condition applies or the record is available. Replacement is confirmed dimmable Tick when this condition applies or the record is available. Insulation and thermal clearance confirmed Tick when this condition applies or the record is available.

Cut-out fits stated range --

Controls compatible from supplied data --

Annual kWh saved -- kWh/year

Annual cost saved -- $/year

Calculation details

Cut-out fits stated range: --
Controls compatible from supplied data: --
Annual kWh saved: -- kWh/year
Annual cost saved: -- $/year
Power reduction: -- %
Installation review required: --
Thermal review required: --

Important notes

Check cut-out, ceiling access, insulation clearance, fire or acoustic ratings, driver location, dimming, heat, product approval, and manufacturer instructions.
Electrical, fire, thermal, and Australian installation requirements need licensed review; this planner makes no automatic compliance claim.

Formulas

$\displaystyle E_{\mathrm{saved}} = n(P_{\mathrm{old}}-P_{\mathrm{new}})hd/1000$
$\displaystyle D_{\min} \leq D_{\mathrm{existing}} \leq D_{\max}$
Downlight replacement depends on fit, controls, thermal conditions, wiring, and product documentation.

Check downlight replacement cut-out fit, dimming compatibility, annual energy savings, and thermal review flags.

Downlight Retrofit Energy and Fit 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