A luminaire 1 comprising a light-directing element 3, e.g. a reflector,
having a light emission window 5. Said reflector has a shape for
directing light originating from an electric light source 7 into an
optical fiber system 9 positioned in front of the light emission window.
The optical fiber system comprises a bundle of optical fibers 11. Said
shape is calculated in accordance with a ray-tracing algorithm which
takes into account that said light source is voluminous, e.g. a Light
Emitting Diode. The reflector has a shape which is composed of n solids
of revolution of parabolic sectors 13, wherein said (adjoining) parabolic
sectors form an integral surface 15. The invention further relates to a
dynamic road marking unit 19.