12v DC LED bulb. You can run the blub from your solar panel (minimum 20 watts panel required), or lead acid battery of 12v. You can also use lithum ion battery for this of 12v.
This led bulb is inbuilt heat sink for long time operation. This bulb have B22 type holder so you can use normal ac line holders to mount it on wall. Its 9 watts white colour Blub.