HARRY POTTER Patronus Light. Officially licensed merchandise. Switch the light on and watch as Harry’s stag Patronus appears from the darkness in a misty, swirl of electric blues and greens. The 25cm (10”) tall light also features the words ‘Expecto Patronum’ on its front and sits inside a plastic base with the Harry Potter logo printed on. The light is USB or battery powered (USB cable included, 3x AA batteries not included) and makes a fabulous gift for lovers of the Harry Potter franchise. A perfect gift for a true Harry Potter fan.