SureFire is now selling new shotgun forend weaponlights.  Like the older SureFire shotgun lights, the DSF unit replaces the entire forend of a shotgun and has built in controls in addition to a white light.

The new units feature flashlights that have a maximum output of 600 lumens and run up to three hours on two CR123A batteries.  SureFire does not offer any candela measurement for the peak beam intensity, but instead states:

The LED’s light is focused by a precision reflector to create a smooth, wide beam perfect for closer-range shotgun applications typical in law enforcement and home defense—with enough reach and surround light to properly identify threats and maintain situational awareness.

Older forend lights from SureFire, the 317 & 617 series, had 100 and 200 lumens output respectively.

The old SureFire 317 series.

Switches on the forend are ambidextrous.  There are both momentary- and constant-on switches.

The new DSF-series lights will be made for the Remington 870, Mossberg 500/590 series, Benelli M1/M2 and Winchester 1200 shotguns.  MSRP is listed as $375.  The 870 lights will ship by the end of the month.  No word on when the others will ship.