Ключевые слова: background, brightness, bulb, business, candle, checking, control, data, device, digital, display, electric, electrical, electronic, environment, equipment, flux, foot, hand, handheld, incandescent, industrial, infrared, instrument, intensity, laboratory, lamp, lcd, led, light, logging, lumen, luminance, lux, measurement, measuring, meter, metering, neon, panel, photo diode, photography, photometer, portable, readers, rennet, sample, sensor, tester, worker,