Circuit design
LED Resistor Calculator
Calculate the series resistance, preferred E24 value, actual current, and safe resistor wattage for an LED circuit.
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Tools & calculators
Practical lighting calculators for circuit design, room planning, and energy-saving comparisons. Calculations run privately in your browser.
Lighting planning
Lumen Calculator
Estimate required room lumens, lighting power, and fixture quantity from room size, target lux, and luminaire efficacy.
Open toolEnergy comparison
LED vs Incandescent Energy Savings
Compare annual electricity, replacement costs, carbon emissions, payback, and multi-year savings when switching to LED lamps.
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