4 Foot T8 with rotatable G13 end caps. Up to 1800 Lumens output. Power is 12-36 Volts AC or DC. Power is applied to G13 at both ends. This wiring should be done in the fixture that accepts a standard T8 or T12 tube light. You have to bypass or remove the ballast. CE and Rohs certified. The viewing angle is 120 degrees. The tube is not dim-able. The led tube has a wide voltage to operate from 12 volts to 36 volts D.C. The tube is made of 1/2 aluminum and 1/2 frosted plastic lens. There are 120 pcs of 2825 SMD led chip for the best illumination possible. PF>90. The diameter is 26mm and the length is 1.2m or 4 foot. This bulb is comparable to a 175 Watt incandescent light bulb but only uses 18 watts. The rated life is up to 30,000 hours. The available color is Daylight White 4000K. This product is a Non Cancelable, Non Returnable, Non Warranty product. This is due that the low voltage tube can be installed in a fixture with a ballast and causes the tube to fail due to over voltage. Each tube is tested before shipping.