The additional brake light has an e-mark = E20.
Also on trucks two brake lamps are required. These are located in the tail lights.
However, depending on the purpose and nature of the structure still further brake lights may be appropriate.
According to ECE regulation 48, Abs.6.7.1. is the attachment of a third brake light on their tractors and trailers or trailers allowed.
The LED auxiliary brake light consists of:
16 high-power diode
Housing is molded in black plastic
Red Lens
waterproof bonded with a special hot melt adhesive
complete with installation material
cable
Article is self-adhesive, but can also be screwed in firmly