L20 Measurements for Tunnel Threshold Zone
For most people a really tricky measurement and with our extensive knowledge and assistance we can make the right corrections in generating the right luminance levels in the entrance and threshold zones in tunnels. We are the first who fully correct the angle of L20 sensors by which these sensors are looking at the tunnel entrances. With our approach we correct the 10% to 40% of errors which normally occur with tunnel photometers.
