also would like the size to be 2x 18650 if possible and have the light is use for work also to weapon mount
sround the size i want is the sunwayman t40cs or the xt20
the search light size is not really an issue but i would like to be able to change batteries or light in the car
thanks
The Klarus XT20 would be pretty good then for you, as it has a floody beam with throw, and also has a useful medium and low, works great as a weapon mount, no problems with recoil, and its pressure switch is one of the only ones that allows you to not only turn it on/off like the others, but to also adjust the brightness, etc....same as the tail cap.
If you were ok with ~ 300 yards range, I'd say its perfect, but at 400 yards, while the "throw" officially reaches, personally, I think the amount of light at the 0.25 lux level, at 400 yards, is too dim to really function in the way I think you want to use it. You could see a horse at 300 yards, 400 yards it might be a hard to see w/o a target with reflecting eyes, etc...clearly.
It does use the double 18650's...is super easy to use, IPX-8 for submersion (2 meters, etc...), but if you really need to SEE things over 300 meters or so, it might be too floody to have that range.
400 meters or so, not "official throw #'s" but of real useful light is getting into heavy hitter categories (Official throw #'s are based upon 0.25 lux on target). 0.25 lux is fine right in front of you, but too dim to use to focus on a target at that range, as even in daylight, a target 400 meters away is hard to resolve well....make the light dim, and, well, its a lot harder, etc.
The Olight SR90, the Fenix TK70, can reach. The Deerelight, Lambdalights and DEFT lights, etc, can reach, but it gets down to how large a patch of light you need to arrive that far away. Most of the throwers put a small circle of light, to concentrate the lumens they have into the smallest surface area/largest lux on target. If the lights are floody, like the TK70, by the time you're at 400 meters, MOST of the lumens have fallen on/been dispersed by things along the way, and are no longer available for the long range targets. The SR90 might put the same lux on target for example, with ~9k fewer OTF lumens, as its a more highly focused beam.
If the time/cost ration works out, you can consider walking 100 meters closer vs buying a light to reach the added distance......and carrying it, etc. Or, you can take the Flashaholic answer, and get both.
:D
So, the XT20 would get you 1,200 OTF lumens on rechargeable 18650's, or you could throw RC123A primaries in there if you wanted to as well, as a dual fuel option.
With medium at 370 lumens and a low at 10 lumens, it might cover a lot of options for you.
Its a bit large to put in your pocket, my jacket pocket works, but a pant pocket would be a bit over matched...not from the battery tube which is normal/18650 sized, but the head. The holster you get with it works great though.