Inputs

Connected lighting load W Enter a numeric project value in W at or above 0.01. Baseline hours per week h/week Enter a numeric project value in h/week between 0 and 168. Proposed scheduled hours per week h/week Enter a numeric project value in h/week between 0 and 168. Expected override hours per week h/week Enter a numeric project value in h/week between 0 and 168. Operating weeks per year weeks/year Enter a numeric project value in weeks/year between 1 and 53. Energy tariff $/kWh Enter a numeric project value in $/kWh at or above 0.

Baseline annual energy -- kWh/year

Proposed annual energy -- kWh/year

Annual energy savings -- kWh/year

Annual cost savings -- $/year

Schedule status --

Calculation details

Baseline annual energy: -- kWh/year
Proposed annual energy: -- kWh/year
Annual energy savings: -- kWh/year
Annual cost savings: -- $/year
Schedule status: --

Important notes

Weekly schedules, cleaning or override hours, weeks per year, and tariffs are dated planning assumptions.
Use actual operating records where available before relying on this schedule estimate.

Formulas

$\displaystyle E_{\mathrm{baseline}} = P \times h_{\mathrm{baseline,week}} \times w_{\mathrm{year}} / 1000$
$\displaystyle E_{\mathrm{proposed}} = P \times (h_{\mathrm{proposed,week}} + h_{\mathrm{override,week}}) \times w_{\mathrm{year}} / 1000$
$\displaystyle S_E = E_{\mathrm{baseline}} - E_{\mathrm{proposed}}$

Estimate annual lighting energy and cost savings from baseline weekly hours, proposed hours, overrides, and a dated tariff.

Lighting Schedule Savings 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

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