This LED lamp is made out of a regular type glass. When upright, the LED light is on and when put on it’s side or stored upside down the LED lamp switches off automatically.
There is a switch available at the bottom of the glass to switch it completely off. With the lamp being LED it is also good for the environment too as it is very low powered. Batteries are used to power the Milk Glass LED Lamp so you need not plug it in.
The Milk Glass Lamps are available from eBay costing just $9.99.
Via: TechEBlog
The usage time is highly depends on the battery quality. For your information, LED light is widely known for its low power consumption compared to ordinary bulbs.