This lamp can be used for electrodeless lamps.

In contrast with all other electrical lamps that use electrical connections through the lamp envelope to transfer power to the lamp, in electrodeless lamps the power needed to generate light is transferred from the outside of the lamp envelope by means of (electro)magnetic fields. There are two advantages of eliminating electrodes. The first is extended bulb life, because the electrodes are usually the limiting factor in bulb life. The second benefit is the ability to use light-generating substances that would react with metal electrodes in normal lamps.
The working lamp is made of Aluminium with plastic handle and can be hanged on the satety helmet or lines. It  is easy to use and can protent the bulb.
It is very widely used, you can prevent many trouble in outdoor work. 
 
Spcial:
AC 230V 60W  E27