In 1943 the War Department contracted with J. A. Maurer, Inc. to make these signal lamps. It's a fully loaded 5 "D" cell flashlight. In the central one degree half angle the candlepower is greater than 3,000 with a peak of 4,500. The beam width for half power is plus 2 degrees to minus 2 degrees, a fairly narrow beam.  When you point it up at night the beam is clearly visible. Can be turned on and off by a trigger or by means of a J-51 hand key and 16 foot cord which operates a relay in the M-227 signal lamp. Can by used hand held either as the plain M-227 or with a rifle type stock using sights on the top.  Permanent mounting on the telescoping leg tripod.  A Red filter hinges down for use with white light. This is not infrared, but just dark red. Such a device allowed for communications between two people at ranges over a mile at noon and neither of them needed to know Morse code. Pulse width modulation where the leading edge is always a clock edge and the time until the falling edge denotes a 0 or 1 bit. That way the receiving station can synchronize the receiving clock. The Signal lamp is housed in a WWII Bazooka Round Bag. Both are excellent.