... 4*7 28W ,application for led streetlight 28W, 56W, 112W, 168W 2. With aluminium PCB 2.0mm thickness, good thermal conductivity, lead-free ... , white oil, 7 ... with lowest attenuation after 3000hours 4. LED Constant drivers for 28W 7 series 4 parallel, AC110V/220V, Diameter 70mm height 40mm ...