2.10.6. "Centre of reference" means:
(a) The intersection of the axis of reference with the exterior light-emitting surface or
(b) A point on or near a retro-reflective area
which is designated to be the centre of the device for the purpose of specifying its performance; it is specified by the manufacturer of the lamp. 		a8c0
2.12. "Centre of reference" means the intersection of the axis of reference with the exterior light-emitting surface; it is specified by the manufacturer of the lamp. a0c0