Unique optical design leading to uniform and comfortable light rays ? High luminarie efficiency over 90% ? Power efficiency over 85% ? Power factor over 0.9 ? Superior color rendering index up to 90 near daylight quality ? Wide color of temperature tuning range from 3000K to 7000K ? Patented apprearance and mechanical structure; Being compact and lightweight ? Constant current and low-voltage drive mode leading to high safety and no glares ? Green and environment-friendly: lead-free, no-mercury, no fragile glass ? No environment-harmful materials ? No light pollution:no IR, no UV, Anti-vibration and shock-proof ? Long lifetime over 50,000hrs (around 10 years lighting 10 hours a day)