The coolest thing

Solar Cap And Wedge Lights
Solar Cap fits 4" and 5" square posts and has four bright LEDs.
Solar Wedge has three bright LEDs that cast a beam of light up to 15'.
2 or more Cap Lights/$49.95 ea. Wedge Lights/29.95 ea.

Mission Cap Lights Powered By The Sun - No Wiring Required!
These are at Plow and Hearth.