I use a go light I think it's the basic model that they have. I had it for awhile not sure which model it is need to dig it out of the shed. I like it when it's snowing and blowing don't need to stick your hand out if your checking cows in a pickup.  Not handy if you need a hand held but has good beam on it.

Mine doesn't seem to stick tight to the cab. Found that out when I was driving down the road at 65 and it fell off the cab. Thankfullynthencord was short enough it didn't hit the ground.