Features: 1- public conversions. Weight, length, power, voltage, - electrical charge, numbers, - frequency and others conversions. 2- lighting calculations. Watt-lumen conversions. Lux-Lumen conversions. Watt-Lux conversions. Candela-Lux conversions. Candela-Lumen conversions. Lux-FootCandela conversions. Color temperature. Types of lamps. Lamps properties.