1.Length&wattage& led q'ty         2ft      10W   48leds                                                                                                             3ft      15W   72leds                                                                                                             4ft      20W   96leds                                                                                                             5ft      24W   120leds                                                                                                              6ft     30W    144leds                                                                                                              8ft     40W    192leds 2.Input Voltage:                           AC86-256V 3.Power Factor:                           0.95 4.Luminous efficiency:                28Lm/ LED 5.Light effect (LM/W):                 110lm/W 6.Color Rendering Index:           >80Ra 7.Viewing Angle:                         120 degree 8.Lifespan:                                  50,000h 9.Tube Material:                          aluminium alloy back+PC cover 10.Color Temperature:               Warm white: 3000k-3500K                                                         Natural white: 4000k-4500K                                                       White: 6000k-6500k