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Surface Luminance Test of an 36" x 48" Economy LED Lightbox Panel
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)

What does this mean?

Excellent, Very Bright: Average Luminance above 2000 LUX
Very Good, Good Brightness: Average Luminance between 1750 and 2000 LUX
Basic Brightness: Average Luminance between 1600 and 1750 LUX
Unacceptable Brightness: Average Luminance below 1600 LUX

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