Luminance is the brightness of a diffuse surface or material.
Luminance is measured in candelas per meter squared, or cd/m2.
The luminance of the center of this office light fixture is 6785 cd/m2.
This was measured with a Minolta luminance meter.
Luminance is measured in candelas per meter squared, or cd/m2.
The luminance of the center of this office light fixture is 6785 cd/m2.
This was measured with a Minolta luminance meter.
|
The luminance of a matte surface is measured either with a luminance meter, or calculated using an illuminance meter.
The illuminance on the desk is 374 lux The reflectance of the desk is 30%. Exitance (M), or light reflected off the desk = illuminance (E) x reflectance (R). So the exitance of the desk is 112.2. Luminance = M/pi or 112.2/3.14 The luminance of the desk is calculated as 35.7 cd/m2 The luminance meter read the desk as 35.4 cd/m2 |