Coyote 12,
What makes you think that you are lighting up your truck with a red lens?
Here is test for you to try. Have a friend of yours stand out at 100 yards and then you shine the light at him from your truck. Your friend should not be able to see your white truck with the red lens and remember, the coyote sees the red light as "black"
If you need to put a hood on, here is a very easy, light weight and noiseless way.
Get some of boxes that are at the stores like Sear's, JC Pennys that they use for shirts, socks, etc.They are the "white" boxes, cut out the bottom and spray the outside with "Flat" black paint. Then wrap the piece around your light to make it fit and then tape it real good. Your hood can now be slipped off and on in about one second and never make any noise.
If your going to be using it in the rain, then spray the cardboard with a silcon spray. My hoods are about 15 yrs old now and still good.
Another tip; I fitted the red lens to the end of the hood and used "electrical" tape to hold it on the end.
All though I have used this system for spotting coyotes for many years I don't use the hood much any more. The reason being, I now use a spot light that has a adjustable focus. By adjusting63 the lens to a wider beam it makes it more harder for the coyote to see my truck, actually when the beam is set right he can nver see the truck.