Section
Calculators
Browser-based calculators for the four sums that come up on every project. Nothing is uploaded; the arithmetic runs locally and each tool shows its formula.
Driver compliance window and headroom calculatorChecks an LED string's forward voltage against a constant-current driver's compliance window at both temperature extremes and across the binning spread — the calculation that catches the fitting which starts fine in the workshop and refuses to start outdoors in January.
LED strip power supply and voltage drop calculatorSizes the power supply for a constant-voltage LED strip run and calculates the voltage drop along the strip and the feed cable, showing why long single-fed runs go dim and colour-shifted at the far end.
Luminaire count calculator (lumen method)Estimate how many luminaires a space needs using the standard lumen method, with the room index computed for you so you can read the correct utilisation factor from the manufacturer's table. Runs in your browser; shows its formula.
Retrofit payback calculatorSimple payback for a lighting retrofit including the lines that are usually left out — access cost, avoided relamping, ballast losses and controls savings. Runs in your browser and shows every formula it applies.