fig7 shows a lighting system 50 including lamp 11 and coupling device 12 as in fig1 it also includes an edge defining member 52 for receiving a light beam from the coupling device and transmitting it through an outlet 52 a with its peripheral edge more sharply defined member 52 can be a tubular quartz rod by way of example that can have one or more of ir uv or ar coatings on either of both of its inlet left shown surface and its outlet surface 52 a system 50 can replace lamp 11 and coupling device 12 in fig1 4 or 7 for instance when replacing lamp 11 and coupling device 12 of fig1 light rays are transmitted from outlet 52 a directly to target area 14 fig1 without the use of intermediate conditioning optics such as 30 in fig2 if redirection of the light is desired an edge defining member 54 with a bend e g as shown in fig8 can be used instead of member 52 thus a light ray 56 received in the left shown inlet of member 53 fig8 exits downwardly through outlet 54 a fig9 a 9e show preferred cross sections of edge defining member 52 fig7 or 54 fig8 along a main direction not shown of light propagation fig9 a shows a rectangular cross section 60 fig9 b a square cross section 62 fig9 c an oval cross section 64 fig9 d a.