I have 2 of these solar LED's shed lights. Used them over a year every day with no trouble. The panel output is weak, but that's apparently by design, otherwise it might overcharge. My panels only see direct sun for a few hours, but it works.
http://www.ikitchen.com/079-709410.html?CS_003=740477&CS_010=079-709410
Bought them at Home Depot and paid about $25. They put out less light, but I've accidentally left them one all day and 9 hours later they still worked (dimly).
I avoided getting the flourescent light version from HF because of it's power use.
4 watts is a moderate drain on AA bats, esp. NiCads. The rating on NiCads from HF is only about .8AH
I can't explain the price variation for this. SunForce makes it, but the price varies from $15 to $60. Home Depot discontinued carrying them so I paid less for the second one.
One of these lights my bathroom (6' x 12').