Our Active Traffic Compensation (ATC, patent pending) technology makes sure only stationary surfaces (e.g. road surfaces and not vehicle surfaces) are contributing to the light measurement. This is accomplished by actively tracking the vehicles and accumulating light measurements only in areas free from vehicles and other moving objects. Research shows that the relative luminance error may exceed 60 percent when measuring without compensation according to EN 13201 in threshold and interior zones. When measuring veiling luminance (Lseq) according to CIE88:2004 in the access zone the relative error may exceed 35 percent at high traffic density. ATC also performs noise filtering and stabilizes the light measurements.



[1] Lindgren, M et al. 2015. ” Traffic Compensated Luminance Estimation”. CIE 2015. Manchester.

[2] CEN. 2003. “Road lighting – Part 2: Performance requirements”. European standard EN 13201-2. Brussels.



The Hyperion™ TVM advanced series of light and traffic sensors for tunnel lighting control applications are being developed by Cipherstone Technologies AB - a well-established computer vision and optronics company celebrating its 10th year in operation