Lighting a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m). The CGS unit of luminance is the stilb, which is equal to one candela per square centimetre or 10 kcd/m. The amount of useful light emitted from a source or the luminous flux is measured in lumen (lm). The SI unit of illuminance and luminous emittance, being the luminous power per area, is measured in Lux. It is used in photometry as a measure of the intensity, as perceived by the human eye, of light that hits or passes
How to Measure a Planet? it brought them a whole new fanbase. "How to Measure a Planet?" remains something of a high point for the Gathering, with tracks from the album making up the majority of their two subsequent live albums, "Superheat (album)" (2000) and "Sleepy Buildings" (2004). In Japan, a one-CD version of the album was released, omitting the nearly half-hour title track. Having already achieved some moderate success with "Mandylion" and "Nighttime Birds", the group felt trapped in an artistically controlled corner, which was very limited due to the high expectations from their fan base. Following the departure of guitarist Jelmer Wiersma, the