Abstract: A helmet rim lighting system comprises a helmet attach mechanism and a housing holding electronics. When attached to a helmet, the housing produces both forward and downward lights. The forward light is generated by at least one forward-facing light, and the downward light is produced by at least one downward-facing light. The forward light directs light from the center horizontally to the left and right, both over 90 degrees, while the downward light is directed towards the ground, continuing the downward line of the helmet’s edge. The helmet attach mechanism is designed to match the contour of a helmet’s front rim. The system can independently activate the forward and downward lights and may include a single input for control. The housing and circuitry are waterproof, and the diffuser can serve as a gasket.