The Spectra Candela II and II-A are among the worlds most advanced and most sensitive exposure meters. Compact and easy to use, it provides an easy, economical means of making highly accurate measurements of indoor and outdoor light levels. Applications include set lighting, video lighting, task lighting, ambient illumination and calculation of lighting ratios. While the Spectra Pro IV-A and Spectra Classic meters are calibrated to measure the spectral response of photographic film, the Spectra Candela meters are calibrated to measure the narrower photopic response curve of the human eye. The Spectra Candela II and II-A meters measure illuminance levels in footcandles or lux and instantly calculates the contrast ratio of your particular lighting situation.
Illuminance is the scientific name for the measurement of incident light.
The Spectra Candela meters are designed for simple, one handed convenience. It reads out directly from 0.1 to 70,000 footcandles and 1 to 100,000 lux - a range encompassing illumination levels from dim indoor lighting to bright sunlight. Lighting contrast is defined as the ratio of the illumination produced by the key light plus fill light to that produced by the fill light alone. Point the meter, from the subject, directly at the key plus fill light. The conversion of footcandles and lux to candelas is most accurately achieved in the context of a single point source of light measured in the dark.