In a parallel with the potential reestablishment of new production of swedish shelters, an awareness of a great potential of modernisation on swedish shelters has occurred. Sweden is in the process of a new potential production of modern swedish shelters, but there is a long process before all the technical details has been updated. This is a bachelor thesis for a degree in mechanical engineering at Karlstad university. The object of this report is to show how a shelter can be best supplied with light during a period when normal power fail. The recommendation of the report is to use wall mounted LED units that are supplied from an electric generator, operated manually by hand. This model has been developed based on swedish regulations for shelters and includes recommendations from these regulations. The concept could also be considered as a necessity for protectetive cautions during realistic crise circumstances. This project was initially a construction developing-oriented project for a specific product that aimed for higher security and functionality in shelters, but resulted in a koncept for light. The method has therefore followed processes for product developing.