led light bar for moose

thinking about putting a light bar on the top part of my windsheild of my rhino . got a set of hid head light now but they don't shine far enough for my liking. Use my rhino here on logging roads and moose are plenty full at night . would like a light bar that is flood and spot how big should i go? 
don't need to be overkill . will a 20 inch or two  6"light be enough .the hid light are a lot better than the factory by a long shot
alan

Im just running a single 10" with HID's and depending where i aim it i can shoot a light beam out that is VERY good for 300 yards and not have a problem seeing at all  If you went with a 20" you would be good to go. 

In my opinion if you get to much light you start getting reflection off of stuff and it messes with me more than helps...but thats just me.

I'd go as big as your budget allows you to. You can fit a 40" between the rails. Bigger the light, more the light you get. I have a 10" and I will be getting a 30" soon.

Alan , how are you going to mount a led bar. ? Are you wanting to mount it right to the windshield ?

I got a 40" double off of flimmy and its unfreakin believeable, talk to him