Just bought a bunch of these 'underwater' solar floodlights, from Northern Tool:
Sunforce Solar Powered Underwater LED Floodlight, Item# 121178
They are very bright for a single LED and they will stay on until dawn if they get a full day's charge. The light is more of a spot light and is better than most flashlights being able to light up over 60 feet away fairly well.
These are great for low maintenance perimeter lighting and [unlike typical solar pathway lights,] are waterproof. Their batteries are NiMH AA cells and are replaceable. The lights plug into the panel with a standard DC barrel connector. They have both stake and screw mounts for all sorts of mounting options.
They are currently on clearance for $19 and won't last long. They are a great deal at this price. - SBReader