Thats the beuaty of a rheostat. Full power is not needed until positive ID and shot is needed. Its AMAZING what a concentrated red beam on low power can pick up in the darkness. Weed is right about the wallmart spotlights. They may be as bright as the sun but if the beam is not focused and concentrated, you just wont be able to penetrate the darkness that deep. No kidding, its not at all unusual to get predator eyes at 500-600yds with a LightForce at full power and a red lens. At low - moderate power, 250-350yd eye shine is the norm. Positive ID up to 200yds at full power is the reality.

It is better to be hated for who you are than to be loved for who you are not...