... Features and advantages: Major replacing E40, E39, E27, E26 lamps CFL, HPS, MH and more directly without any modification ... 80% more energy saving compared with conventional street light, CFL, incandescent light Estimated lifespan: 50, 000 ... warm-up or cold start problems Solves 4 difficulties for LED packaging, heat sinking, operational lifespan, luminous efficiency Special ...