Akari Rules

Akari is a Japanese surname meaning "light."  The puzzle is also called Light-Up, and for obvious reasons once you try one.  Here are the rules.

1.The puzzle consists of a grid with some black cells and some white cells.  Some of the black cells contain numbers.
2. Light bulbs must be placed into the white cells.  The numbers in the black cells indicate how many horizontally and vertically neighboring cells contain light bulbs.  Black cells with no numbers can contain any number of neigboring bulbs.
3. Light bulbs illuminate all the cells in the row and column they are in, up to the edge of the grid, or to a black cell, whichever comes first.
4. No two light bulbs can illuminate each other.

Below are a sample puzzle and its only solution.