Surface Luminance Test of an 22" x 28" LED Lightbox Stand
 
A Surface Luminance Test measures the amount of illumination or light intensity on a subject. Measured in lux, or lumens per square meter, the test indicates the amount of visible light incident on a surface. This luminance test was given with an Extech Instruments Foot Candle/Lux Meter, approximately 10 minutes after lighting up. The numbers correspond to spots tested along the surface of the light box. As you can see, this test indicates that the lightbox produces even light across the viewing area; there are no hot or cold spots. The light distribution is uniquely designed to decrease hot and cold spots.
Surface Luminance Test (unit: lux)
luminance test

** Please note that these are average lux readings and that variances may occur between bulbs, environments, etc.