obasjati

1. to light up; to illuminate
   Sunce je obasjalo celu sobu. — The sun lit up the whole room.
   Farovi su obasjali put ispred nas. — The headlights lit up the road ahead of us.
2. (of a face, smile) to light up
   Osmeh joj je obasjao lice. — A smile lit up her face.

The imperfective is obasjavati.