Controlling the heat generated by LEDs is essential to maintain LED light output and product life. Traditional thermal management combines current control and heat sinks to assure that lighting fixtures can meet worst-case scenarios. Thermalok™ is a revolutionary passive thermal management system that combines extremely low thermal conduction paths, induced natural convection and a unique, patent pending thermal storage system. Thermalok™ “locks” the junction temperature of the LEDs by storing heat generated by LEDs, thereby allowing the LEDs to run at their full capacity without degradation in output or life. Even extreme fluctuations in ambient temperature have little effect on Thermalok™ thermal capacitance. Thermalok™enables 30 to 40% more light output and allows new paradigms in fixture design as worst-case design constraints can be relaxed. Thermalok™ is suitable for both indoor and outdoor lighting applications.