At 3AM, the light really isn't that important to me. I'm not going to answer the door anyway. Anything important enough to knock on my door at 3AM should be important enough for them to wait until 5:30ish-when I get up. However, if they continue to knock on the door, I may try to establish the limits of their resolve by starting up my Husqvarna chainsaw in the foyer. If they're still around I may shine my Ra at them.