Crest factorú¦ < 1.7 Operating frequencyú¦ 30khz ~ 50khz Environment temperatureú¦ -15íµ ~ 40íµ Color temperature rangeú¦ 2700k ~ 6500k E-rectifier average lifeú¦ > 15000 hours Lamp average lifeú¦ > 8000 hours Lamp tubeú¦ tri-phosphor Special featuresú¦ lamp abnormal protection function. 1pc/color box, 100pcs/carton