In this scenario, the weapon light provides intermittent bursts of light as you move through your home, illuminating areas of negative space to ensure that it is clear of any threats. In this setting, spill is more important than throw, so you should prefer lights with high Lumen ratings and low-to-medium Candela ratings. A wide beam can light up larger areas of a room with greater efficiency, allowing you to scan the room instantaneously. If your light lacks the spill to fill a room, you'll be giving an opportunity to any threat that hides outside its beam. The other advantage of a wide beam is that its blinding effect will affect a larger area, making it easy to disorient a potential attacker. If you are clearing a room with a narrow beam and started scanning on the wrong side of the room, you wont disorient the intruder and you've just exposed yourself with the light's source.