Light not showing after iPhone build

Hi, In my scene (iPhone Game) I have a large area for the character to run around on, with no ambient light and no lights except for a spotlight over the character and the surrounding area. When I play the game in the Unity Editor everything works fine and the spotlight follows the character. However when I build it to my iPhone and play, no light shows up and the area is just a dull and dark.

Anyone know why this is happening?

Thanks.