Lighting calculators for illuminance, lumen output, fixture quantity, connected load, LED energy, and emergency backup planning.
3 calculatorsEstimate emergency-lighting battery Wh and Ah from fixture load, duration, efficiency, depth of discharge, aging, temperature, and design margin.
Open calculatorCalculate connected lighting watts, input VA, current, energy, circuit quantity, loading per circuit, and LED driver inrush screening.
Open calculatorCalculate required lumens, LED fixture quantity, achieved illuminance, connected watts, current, and preliminary lighting-circuit count.
Open calculatorLighting calculations connect the required maintained illuminance with room area, fixture lumens, utilization, maintenance, mounting, power, controls, and circuit loading.
A lumen-method estimate is useful for early fixture quantity and electrical load planning, but it cannot prove uniformity, glare control, visual comfort, or emergency-lighting compliance.
The target lux or footcandles should come from the actual space and task requirement. Fixture efficacy alone does not determine delivered illuminance because room geometry, optical distribution, surface reflectance, utilization, and depreciation affect the result.
Electrical design must also account for LED driver inrush, power factor, harmonics, dimming and control gear, emergency supply, voltage drop, and switching-device duty.
Estimate lumens and fixture count from target illuminance, area, utilization, and maintenance.
Calculate connected watts, current, circuit quantity, voltage drop, and control-device loading.
Screen backup energy, operating duration, LED savings, and maintained-light output.
Lumens describe light emitted by a source. Lux describes lumens received per square meter on a surface.
No. Target illuminance, fixture lumens, utilization factor, maintenance factor, layout, mounting, and photometric distribution are also required.
LED drivers can produce high short-duration inrush. Breaker curve, driver quantity, inrush data, switching device, and manufacturer guidance must be checked.