(d) Any interdependent lamp system composed of two or three interdependent lamps marked "Y" approved together and providing the same function [DEL] .

 a1c0
(d)Any interdependent lamp system composed of two or three interdependent lamps providing the same function, approved together as type "Y" and installed so that the distance between adjacent apparent surfaces in the direction of the reference axis does not exceed 75 mm when measured perpendicularly to the reference axis. a0c0