red light, does not project a beam, or near as much heat as a white light, you can get red lenses for some flashlights in sporting good departments, aor radio shack has some for certain lights they sell(or at least used to)
or if all else fails, take a red piece of plastic and tape it over your flashlight lenses
the beam projected by other lights, often spooks the critters you are trying ot spot before you get a chance to actually see them
HTH