LCD luxrneter - illumination indicated digitally

LCD luxmeter elektor march 1983 illumination indicated digitally efr4P4ii j "boy This is a new and up-to-date measuring instrument; it is convenient, compact and digital: the DLM. The digital luxmeter is the latest member of our growing family of digital measuring instruments with simple construction, thanks to a high level of integration. It is intended for accurate measurement of illumination, in two ranges: 0.1 ... 200 lux and 10 ... 20,000 lux. Its low current consumption of only 2 . .. 4 mA makes the instrument independent of the mains and useful for portable applications. LCD luxmeter Table 1. Illumination figures for natural light sources and guide values for artificial lighting. Table 1 Natural light Clear night, full moon Winter"s day in December with overcast sky Summer"s day in June with overcast sky Winter"s day in December with clear sky Summer"s day in June with sunlight Artificial lighting Candle light at 1 m distance Side roads Main roads Staircases, railway platfo...