... ,UL,ROSH lifespan: 100,000 hours lumen : 80 lm/w wattage 40W ~ 120W power factor 0.99 For solar LVD induction street ... DC voltage item, it is best choice to use in solar system. Together with street fixture, better choice than LED stree tlight ... . ( 1 year @ 24 hrs/Day )( Change 274 Bulbs Every Year )100,000 hrs. (10 years @ 24 hrs/Day)( Change ZERO Bulbs ...