Calculators

Lighting calculators

Illuminance, fixture counts, spacing, power density, running cost, and retrofit payback, each with visible math and stated assumptions.

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Lighting Retrofit Payback Calculator

Simple payback, lifetime net saving, and return on capital for a lighting upgrade, with incentive support.

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Before and after kWh, demand, and dollars for an LED retrofit of an existing lamp or fixture population.

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Annual replacement volume, consumable cost, labour hours, and the relamping interval implied by rated life.

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Drivers per project, VA and current per circuit, and the inrush figure that decides whether a breaker holds.

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Annual kWh, dollars, and emissions for a lighting load from connected watts and operating hours.

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Installed lighting watts per square foot against the allowance for the space, including credited controls.

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Maximum centre-to-centre spacing from mounting height, luminaire distribution, and the illuminance target.

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Turn a target illuminance and room size into a fixture count and a rectangular row and column layout.

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Check the average lux and foot-candles a fixture count delivers, and see how far it lands from the target for the space.

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How many lumens a room, office, or warehouse floor actually needs, with a maintenance allowance already built in.