Inputs

Existing fixture count Enter a numeric project value at or above 1. Existing watts per fixture W Enter a numeric project value in W at or above 0.1. Existing lumens per fixture lm Enter a numeric project value in lm at or above 1. LED fixture count Enter a numeric project value at or above 1. LED watts per fixture W Enter a numeric project value in W at or above 0.1. LED lumens per fixture lm Enter a numeric project value in lm at or above 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. Control compatibility confirmed Tick when this condition applies or the record is available.

Existing total lumens -- lm

LED total lumens -- lm

Lumen change -- %

Power reduction -- %

Calculation details

Existing total lumens: -- lm
LED total lumens: -- lm
Lumen change: -- %
Power reduction: -- %
Annual kWh saved: -- kWh/year
Annual cost saved: -- $/year
Controls or output review required: --

Important notes

Compare system lumens, optics, glare, CCT, CRI, flicker, dimming, emergency interactions, thermal limits, mounting, and manufacturer compatibility data.
Electrical work, commissioning, lighting quality, and Australian installation requirements need qualified review; this calculator makes no automatic compliance claim.

Formulas

$\displaystyle \Delta L\% = (L_{\mathrm{LED}}-L_{\mathrm{old}})/L_{\mathrm{old}}\times 100\%$
$\displaystyle \Delta P\% = (P_{\mathrm{old}}-P_{\mathrm{LED}})/P_{\mathrm{old}}\times 100\%$
System lumens, watts, controls, glare, and product compatibility must be explicit.

Compare existing and LED replacement power, lumens, annual kWh, cost savings, and control-review assumptions.

LED Replacement Calculator 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