[mongoose44]

Thank you for the replies, I do in fact have several of Theo's books already. In this case, at the moment, my inquiry is more general. I am discussing with friends, the overall or average % of success of searchlights actually coning an aircraft long enough; say 22s plus. I suppose one should separate the period before general use of radar controlled lights from earlier ones probably tracking though sound. Both are of interest but I assume the radar controlled lights had a much higher rate of success.