However, at night time the eye sensitivity shifts to the 507 nanometer (Moonlight - cyan) range which leads to optimal Scotopic vision but less (measurable by existing meters!) lumen. Ellipz makes street lights with a high Scotopic and low Photopic range which leads to a HIGH S/P ratio of around 3 whereas traditional LED streetlights have a S/P ratio of 2.4 to 3.4. So their lumen/m2 (= lux) is higher as it ONLY measures Photopic lumen.
Ellipz has started the discussion that a high S/P ratio leads to better vision at night even though you have less Photopic lumen (less lux on the street). This view is slowly getting adopted by all major lighting organizations like Lighting Research Center of the Van Rensselaer Institute and the US Department of Energy. See our white paper for more information on this topic (live link).
So the high S/P ratio is not the problem in regulation but the low Photopic lumen resulting in a low lux level. We are actively working with our US partners to address state and federal regulation.