Inputs

Analysis period years Enter a numeric project value in years between 1 and 50.

Retrofit scenarios

Add one row for each relevant space, item, zone, document, or measurement set.

Row 1

Scenario name Enter the project label, note, or reference used for this calculation. Fixture count Enter a numeric project value at or above 1. Watts per fixture 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. Upfront cost $ Enter a numeric project value in $ at or above 0. Annual maintenance savings $/year Enter a numeric project value in $/year at or above 0.

Row 2

Scenario count --

Lowest annual net cost -- $/year

Lowest lifecycle cost -- $

Professional review required --

Lowest annual cost scenario --

Lowest lifecycle cost scenario --

Comparison table --

Calculation details

Scenario count: --
Lowest annual net cost: -- $/year
Lowest lifecycle cost: -- $
Lowest annual cost scenario: --
Lowest lifecycle cost scenario: --
Comparison table: --
Professional review required: --

Important notes

Compare photometry, task lighting quality, glare, emergency interactions, controls, maintenance access, product life, commissioning, and dated cost assumptions.
Electrical, safety, financial, and Australian compliance implications need qualified professional review; this comparison makes no automatic compliance claim.

Formulas

$\displaystyle E_i = n_iP_i h_i d_i/1000$
$\displaystyle C_i = C_{0,i} + Y(E_iT_i - M_i)$
Scenario ranking is decision support, not a lighting-quality or compliance decision.

Compare repeatable retrofit scenarios by annual kWh, annual net operating cost, and simple lifecycle cost.

Lighting Retrofit Scenario Comparison 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