The blackouts of World War II (1939–1945) and the shuttered car headlights then in use demonstrated the value of Shaw's invention and helped popularise their mass use in the UK.
二战时（1939-1945）的灯火管制，以及当时使用的汽车开合头灯，彰显出了肖的发明的价值，有助于其在英国的大量推广应用。