The footprint light source with LED chip has good coloration spectrum and high intensive illumination. The light source is anti-knock in all-weather environment. It is operated with lithium battery which can be used for 2 hours continuously when fully charged. It is a good solution for field criminal investigation, reconnaissance, search and rescue, etc. in the state of no electricity. The light is widely used in military affairs, police, criminal investigation, patrol, security, search and rescue, exploration, reconnaissance, etc.