The 2140-C 3-Way Switching Flashhead contains the controls to operate at full power or ratio the power and the modeling light down one stop (-1) or two stops (-2). The flashhead cannot be turned completely off.
The 2140-C Flashhead comes equipped with a 1000 watt-second flash tube (color corrected to 5500'K), 100 watt tungsten modeling lamp, 25' cord, and a mounting bracket with knobs for securing the bracket to a light stand and attaching an umbrella. This bracket also has a universal adapter base which allows it to mount to either a standard 5/8'' stud (with an optional accessory 4041 adaptor it can also mount to a smaller 3/8'' tube/stud).
CAUTION: This flashhead must not be used in the stop down mode if it is the only head plugged into a powerpack. There must be another flashhead plugged into the same pack and set to operate at full power or damage to the 2140-C will result. This will void the warranty.