... Temperature -20~+40°C9,Application environment-- indoor (wall & ceiling )10,Life span ≥50000h11,Illumination ≥410/1.5M12,Operating frequancy 50--60HZ ... the traditional 40W fluorescent lamp,the same illumination efficiency can save 70% energy.2,environmental –friendly ——no UV radiation,no ... radiation,no heat, no leak danger of mercury.3,long life span——50,000h,10 times than traditional one. the light ...