valomittarit
Valomittarit are instruments that measure the intensity of light. In Finnish, valomittari means a light meter, and valomittarit refers to the plural. They are used to quantify exposure in photography and cinematography, and to assess daylighting, horticultural lighting, and occupational safety.
There are several types: handheld light meters, built-in meters in cameras, and specialized meters for studio
How they work: a sensor, usually a silicon photodiode or phototransistor, converts light to an electrical signal.
Applications: in photography and cinema, valomittarit guide exposure for correct brightness and contrast. In architecture and
Calibration and standards: modern meters are calibrated to national or international standards and are traceable to