Voltcraft bl 10l digital light meter voltcraft bl 10 l p the voltcraft bl 10l light meter has been designed to measure the intensity of illumination and the incidence of light on a certain surface area the measurement is carried out via a silicon photo diode p p the readings can be displayed in lux lx or foot candle fc as required moreover the maximum readings for a particular measurement process can be shown with the help of the integrated ir filter only the visible range of th