all that needs to be done is to firmly grasp the shield 98 and rotate it either clockwise or counter clockwise as viewed in fig3 and thereby angularly reposition slot or cut out 120 to in turn re direct the path of light passing therethrough once thusly repositioned the shield 98 will remain in such selected attitude because of the friction existing as among surfaces 62 114 and cooperating elements 124 68 and 130 the entire illuminator assembly may be supported as on related support or panel means 25 and retained thereagainst as by a washer member 170 and nut 172 cooperating with threaded portion 60 fig6 illustrates another embodiment of a light shield assembly all elements in fig6 which are like or similar to those of preceding figures are identified with like reference numbers provided with a suffix 34 a 34 referring in greater detail to fig6 and by way of comparison referring also to fig2 it can readily be seen that in the main shield structure 98a is comprised as of shield 98 and body portion 52 of fig2 that is in the embodiment of fig6 the inner surface 106a now extends to and terminates in annular wall 70a and threaded portion 60a and enlarged outer surface 51a are now an integral portion of the wall portion 110a as are ramp surfaces 76a 80a and enlarged inner surface 74a in the preferred form of the embodiment of fig6 the surfaces 76a and 80a are preferably circumferentially continuous and the entire shield structure 98a although able to be formed of any suitable material is formed of metal such as for example aluminum alloy as can be seen the shield.