We are offering Add Solar Par20 Led Solar Bulb. 1, Compared to traditional LED heatsink, our's dissipating area is bigger, air convection is better, the temperature will be lower at least by 11 degree for PAR38. 2, Fin-shape design, there is no thermal silica inside the heatsink. 3, The weight of the cooling structure is lighter, only 50-60% of the traditional Cooler. 4, Good heat dissipation. 5, Very beautiful. The cooling structure is under patent protection.(Included the appearance.