1. Perfect shell: Beautiful shell, with both oxidation and corrosion resistance. 2. Long life: With the integration of a thermal body , low thermal resistance, and stable performance. 3. Used a special secondary optical design:Adjustable brightness achieving the best lighting effects desired. 4. Environmental friendly: No harmful substances such as mercury, lead, cadmium or other toxic matter to the environment. It fully complies with the ROHS criterion (constituted by the European Union).