Industry Articles
Vision & Exterior Lighting: Shining Some Light on Scotopic & Photopic Lumens in Roadway Conditions
(reprinted with permission)
Summary
The human eye contains 2 major light sensitive photoreceptors, namely cones and rods each with its own spectral sensitivity, photopic sensitivity for cones and scotopic sensitivity for rods. At light levels typical of night time roadway lighting, both cones and rods can be active and both spectral sensitivities could apply. However for straight ahead viewing where the line of sight is directed to distant object detection and recognition, such as a pedes
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Mar 24th 2025