Mercury-free nanometre street lamp is a combination of street light and mercury-free nanometre energy saving bulb to instead of sodium lamp in street. Mercury-free ismore environmental protection. 0.99 high power factor will not effect city block electric power stability.It willlead to city block transformer more stable. 80lm/w high luminous efficiency,80W=150W sodium lamp,130W=250W sodium lamp,240W=400W sodium lamp 20000hourslong life span can work more than 3 years. IP85