Electricity Calculator Group

Lighting Calculators

Work with lumens, illuminance, beam geometry, LED power, controls, and lighting energy.

Choose the electrical result you need

Photometric results depend on fixture distribution, reflectance, mounting, maintenance, and the measured task plane.

Open the calculator whose primary output matches the decision at hand. Each worksheet shows its formula, loaded example, input definitions, limitations, and related calculations.

Lighting worksheets

Lumens WattsCalculate lamp power for a defined electrical case.Lux LumensCalculate average illuminance for a defined electrical case.Foot-Candles LuxCalculate illuminance for a defined electrical case.Candela LumensCalculate luminous intensity for a defined electrical case.Light Beam DiameterCalculate beam diameter for a defined electrical case.Inverse Square LightingCalculate illuminance for a defined electrical case.LED Driver CurrentCalculate driver output power for a defined electrical case.LED Strip PowerCalculate strip power for a defined electrical case.LED Strip Power SupplyCalculate minimum supply rating for a defined electrical case.LED Strip Voltage LossCalculate voltage loss for a defined electrical case.LED Array ConfigurationCalculate total LEDs for a defined electrical case.Dimmer LoadCalculate dimmer loading for a defined electrical case.Lighting Circuit CurrentCalculate circuit current for a defined electrical case.Light Fixture SpacingCalculate fixture spacing for a defined electrical case.Daylight FactorCalculate daylight factor for a defined electrical case.Illumination UniformityCalculate uniformity ratio for a defined electrical case.Lighting Wall-Plug EfficiencyCalculate wall-plug efficiency for a defined electrical case.Occupancy Sensor SavingsCalculate annual energy saved for a defined electrical case.Lighting Energy CostCalculate annual lighting cost for a defined electrical case.Lumen DepreciationCalculate maintained lumens for a defined electrical case.

Use ratings and measurements deliberately

Keep voltage type, current path, frequency, phase arrangement, operating time, and temperature with the result. A value taken from a nameplate may describe a different condition from a meter reading.

These calculators support arithmetic and comparison. They do not replace electrical codes, equipment instructions, qualified design, safe isolation, or test procedures.