A dark bulb

[ErGingerbreadMandude]

Oor I could use my dark bulb to emit tiny little things that can reflect light, so I fill up my room with this tiny little things and light would gradually disappear. Because light gets more and more reflected and losses energy more quickly as I introduce more and more of these tiny little buggers . All I have to do is produce enough of those tiny little things so that the amount of photons that's entering the room can reflect and disappear just as they enter in.

Now all I have left to do is figure out what those tiny little things that can reflect light is..
I can't make it dust because people with die, I can't make it molecular level water droplets because a steady supply for 3 mins will fill up my room.. Dammit..asshole photons..