Surefire Scout Lights, DSF 500/590 and DSF 870 Weapon Lights.

M300 Mini Scout Light LED WeaponLight Tailcap Switch Only
$389.95

http://i.imgur.com/lcc41KV.png

Max Output -- White Light 300 .0 lumens
Tactical Runtime** 1 .3 hours
Length 4 .10 inches
Bezel Diameter 1 .125 inches
Weight w/Batteries 4 .8 ounces
Batteries 1 123A (included)
** Runtime (at highest setting for multiple-output
lights) until output drops below 50 lumens.

M600 Ultra Scout Light-LED WeaponLight Tailcap Switch Only
$439.95

http://i.imgur.com/CF3qdYn.jpg

Max Output -- White Light 600 .0 lumens
Tactical Runtime** 1 .5 hours
Length 5 .4 inches
Bezel Diameter 1 .125 inches
Weight w/Batteries 5 .6 ounces (approx.)
Batteries 2 123A (included)
** Runtime (at highest setting for multiple-output
lights) until output drops below 50 lumens.

Surefire DSF-500/590 Ultra-High Two-Output-Mode LED WeaponLight for Mossberg 500 & 590
$485.95

http://i.imgur.com/znfZPbg.png

Output / Runtime -- White Light
High 600 lumens / 1.5 hours
Low 200 lumens / 3.0 hours**
Tactical Runtime** 3 .0 hours
Bezel Diameter 1 .37 inches
Weight w/Batteries 18 .2 ounces
Batteries 2 123A (included)
** Runtime until output drops below 50 lumens.

Surefire DSF-870 Ultra-High Two-Output-Mode LED WeaponLight for Remington 870
$485.95

http://i.imgur.com/dkFgynb.png

Output / Runtime -- White Light
High 600 lumens / 1.5 hours
Low 200 lumens / 3.0 hours**
Tactical Runtime** 3 .0 hours
Bezel Diameter 1 .37 inches
Weight w/Batteries 17 .8 ounces
Batteries 2 123A (included)
** Runtime until output drops below 50 lumens.