The reflective and non reflective surfaces 92, 94 can be achieved by painting {TAIL ~ the inner surfaces} of the walls of the light trap structure 42 with {HEAD ~ appropriate reflective and non reflective paint}  
The reflective and non reflective surfaces 92 , 94 can be achieved by painting { TAIL ~ the inner surfaces } of the walls of the light trap structure 42 with { HEAD ~ appropriate reflective and non reflective paint }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH