To provide an LED light tube capable of making an illumination pattern of comparatively wide angle and efficient and uniform illumination.
An LED light tube is provided with a semitransparent casing 10 having an opening 13 and a heat sink 20 having a holding part 23. The heat sink 20 is coupled to the casing 10 so that the opening 13 of the casing may be covered with the heat sink 20. The heat sink 20 and the casing 10 constitute a tubular structure having an inner cavity composed of a lower half cavity and an upper half cavity. The holding part 23 is provided with the heat sink 20 located in the lower half cavity, a circuit board 30 fixed to the holding part 23 of the heat sink 20 thermally conductively, one or more LED light sources 40 installed on the circuit board 30, and two end part caps 50 inserted suitably at two ends of the tubular structure.
Shinichi Mizuta
Yasuo Itaya