Sam Gorman

Estimate LED strip feed-wire voltage drop, percent loss, max one-way wire length, and a wire size that meets your limit.

Size an LED strip power supply and optionally check lead-wire voltage drop using strip length, watts, voltage, wire length, and AWG.

Find the LED resistor value, standard rounded resistor, actual current, and resistor heat for one DC LED string.

Convert foot-candles to lux or lux to foot-candles with exact factors, rounding control, and optional extra readings.

Convert candela or mcd to lumens from a beam angle or solid angle, with beam spread and sphere share checks.

Convert lumens to candela using beam angle, wide and tall angles, or solid angle, with the steradians used shown.

Convert lux to lumens for a room, known area, or sphere, with optional loss factors for fixture lumen estimates.

Convert lumens to lux by lit area, cone beam, or bare bulb spread, with foot-candles and target comparison.