Abstract: A burglar-proof guard for electric bulbs positioned in a socket having a peripheral shoulder consisting of a pivoted frame member mounted on the top portion of the bulb and a second pivoted frame member extending about the socket with three rods and a threaded bolt extending therebetween. Each of the pivoted frame members consist of a pair of semi-circular members with bores at the ends and at a mid-portion and the rods and bolt extending through the bores. The bolt is provided with a nut and a bore for receiving a lock preventing the removal of the guard from the light bulb without a key for the lock.