<font size="2" face="Verdana, Arial">Lux is a unit of illuminance [lumininous flux density] not intensity. *If* you use the intensity value from the Luxeon datasheet of 180 cd, this would yield an illumination of 1.8 lux at 10 meters.Originally posted by Bandgap:
Does anyone have an intensity figure (in Lux) for a white Luxeon Star/O measured at 10 metres (33 feet)?
<font size="2" face="Verdana, Arial">Lux is lumen per square meter, right? Cd is lumen per steradian? So at 1 meter, the illuminance measured in lux should be numerically equal to the intensity in Cd, and at 10m the illuminance measured in lux should be 1/10^2 the intensity in Cd, or 1.8 lux. Am I missing something here?Originally posted by Doug S:
Lux is a unit of illuminance [lumininous flux density] not intensity. *If* you use the intensity value from the Luxeon datasheet of 180 cd, this would yield an illumination of 0.18 lux at 10 meters.
<font size="2" face="Verdana, Arial">Lux is lumen per square meter, right? Cd is lumen per steradian? So at 1 meter, the illuminance measured in lux should be numerically equal to the intensity in Cd, and at 10m the illuminance measured in lux should be 1/10^2 the intensity in Cd, or 1.8 lux. Am I missing something here?Originally posted by Jonathan:
</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by Doug S:
Lux is a unit of illuminance [lumininous flux density] not intensity. *If* you use the intensity value from the Luxeon datasheet of 180 cd, this would yield an illumination of 0.18 lux at 10 meters.