During testing today at Barcelona, Mercedes are trying out new lights that appear to work independently of the rear rain light, which suggests that they don’t serve the same function.
The lights are incorporated into the rear wing endplates and look very similar to the thin brake lights seen on FIA WEC LMP1 class of endurance prototype over the last few years.
Bit of a buzz this morning about Lewis’ #F1Testing light set-up…
We’re testing a new system for @F1 this morning 🚨
— Mercedes-AMG F1 (@MercedesAMGF1) May 15, 2018
It’s been suggested that the new lighting could be a safety measure to increase the visibility when another car is following.