For automotive mechanics, an LED light is a must-have tool. LED flashlights and headlamps allow car experts to peer deep into engine blocks. Sometimes, a strong, far-reaching beam is needed to diagnose a problem inside the engine. At other times, more scattered LED light is required, for seeing the bigger mechanical picture. Beyond these needs, mechanics’ flashlights should be tough (look for a strong warranty, such as our lifetime guarantee), waterproof (engine liquids are not kind to cheapo torches) and ergonomic.