Lighting Calculation Tools
Base your lighting decisions on data: from your old bulb's LED equivalent to an energy payback period, to the floor circle a beam cone leaves behind — all computed instantly, right in your browser.
Flagship Tool
How Many Spots Does My Room Need?
Enter your room's size and type to instantly see the recommended fixture count, layout and total power draw. A detailed, comparative mode with a PDF report is also available.
Calculate for my room
Quick Answers
Lumen ↔ Watt ConverterFind your old bulb's LED wattage equivalent, or how many lumens a given wattage gives — instantly.Colour Temperature (Kelvin) PickerDrag between 2000-6500 Kelvin and see the light's colour and room effect live.Energy Savings & PaybackCalculate the yearly savings and payback period of switching your old lighting to LED.LED Lifetime (L70/L80)See how many years your LED will last for your usage pattern, and its flux decay curve.Unit ConverterConvert lux, footcandle, metres, feet, Kelvin, mired, watts, BTU and IP ratings.
Design & Simulation
Beam Cone & Spot DiameterSee the illuminance and floor diameter a beam angle, lumen output and mounting height produce.Isolux SimulationSee the illuminance distribution on the horizontal plane beneath a luminaire, on a grid.IES/LDT Photometric ViewerUpload your own IES or LDT photometric file and preview its light distribution curve.Track & Spot Layout CalculatorCalculate evenly spaced spot fixture positions along a track, based on track length and edge margin.Variant ComparisonCompare 2-4 product variants side by side by lumens, watts, efficacy, CCT, CRI, beam angle and IP rating.
Electrical
Voltage Drop CalculatorCalculate voltage drop from cable cross-section, length and current, and find a suitable cross-section from standard sizes.Circuit Load CalculatorCalculate circuit current from total fixture wattage, see breaker utilization and the maximum number of fixtures a circuit can carry.
Use With Our Products
Every tool is built to work with real fixture data from our catalogue (lumens, watts, beam angle) — add your results straight to your quote list.
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