LEDs & Lighting
Every leds & lighting calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
5 calculators in this section
- LED Array Calculator (Series and Parallel Strings)Turn a supply voltage, an LED forward voltage and a total LED count into a real arrangement: how many LEDs go in each series string, how many strings, the resistor each string needs and its wattage — and how much of your supply the resistors burn rather than the LEDs.
- LED Series Resistor CalculatorThe resistor an LED needs: exact value, the next standard value up, the current you actually get with it, the resistor's power and wattage rating, and the circuit's efficiency — for one LED or a string in series.
- LED Strip Power Supply and Voltage Drop CalculatorTotal power, supply current and the power supply size for a run of LED strip — and the part that catches people out: the voltage the strip's own copper loses along its length, how much light that costs at the far end, and exactly what injecting at both ends or moving to 24 V buys you.
- Lumens to Watts Converter (Luminous Efficacy)Lumens to watts and back through luminous efficacy, with typical figures for incandescent, halogen, CFL and LED — plus lumens to candela to lux for a beam angle you give, and the old-bulb equivalent people actually want.
- Room Lighting Calculator (Lux and Lumen Method)The lumen method, worked properly: room index, the total lumens a room needs at your target lux, how many fittings that is, the whole grid you can actually install, and the illuminance that grid really delivers — new and after maintenance losses.