{HEAD ~ 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 appropriate reflective and non reflective paint  
achieved by painting
{ HEAD ~ 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 appropriate reflective and non reflective paint
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH