Rules of Akari

Place lightbulbs in the white cells according to the following rules:

1. Lightbulbs light up all cells in the same row and column, including the cell they're in, up to a black cell.
2. All cells must be lit up.
3. No lightbulb may light up another lightbulb.
4. Numbers on black cells represent the number of lightbulbs orthogonally adjacent to that cell.

Below is an example and its answer.