The second reason is that red light does not bleach the photopigment we depend upon for our night vision. Consequently, one can use a red light briefly to fill out a data form and still be able to see in the dark when the light is turned off. Not all reds are the same. In the USA, some makers of small flashlights offer a red lens that also is very good. Most red films of acetate that one might use to cover a flashlight fade quickly and because of this are not very good.
Red tape is fair in a pinch but it diffuses the light too much to focus it well.
Don't fear the dark. Most people are surprised by how well they can see at night without artificial lighting. If the moon is out, one may even read a wristwatch. Losing a dependence on artificial light will allow one to see well beyond the flashlight beam. Believe it or not, one can generally see the silhouette of a turtle at a greater distance without a flashlight.