Description：Features: 1.EMS Energy management system, ensure 10 rainy days back up. 2.Built-in MPPT technology to track the maximum sun for quick charging. 3.18 hours full brightness after full charge, or 36 hours in dimming mode. 4.Pure aluminum extruded housing ,battery replaceable design. 5.IP66 Waterproof and pass 16 grade wind proof test. 6.Up to 10000 lumen(80W) High efficacy Nichia LED chip, 60000 hours/10 year lifetime. 7.Adjustablemultiple installation angles either for straight single arm pole or curve double arms. 8.3 year warranty, 6 years long lifetime battery, no problem with working in 60 degree ambient temperature.cacy Nichia LED chip, 60000 hours/10 year lifetime. 7.Adjustable multiple installation angles either for straight 6 years long lifetime battery, no problem with working in 60 degree ambient temperature.