Explorer (EX) Series Headlamps Hands free and worry free lighting is what you’ll find here. The Explorer (EX) series of headlamps offers a wide range in lumens, from 80 to 550. Each with long run times, multiple lighting modes and lightweight design, rest assured, there is an option for every hands free lighting need you want to throw its way. Go on that evening run, cross off items on that honey-do list and hit the caves in style. No matter the task, Olympia headlamps are ready when you are.