Patent ID: 7976185

Claim:
A light emitting diode (LED) lamp tube comprising: a lamp device including a circuit board, a plurality of LEDs mounted on said circuit board and electrically connected to said circuit board, and two electrode seats adapted to be electrically connected to a power source and electrically connected to said circuit board; and a tubular enclosure including an inner peripheral surface, said circuit board being disposed in said tubular enclosure such that said inner peripheral surface of said enclosure is divided into a non-illuminated portion and a light-receiving portion that is positioned for receiving light emitted by said LEDs, said tubular enclosure further including a plurality of tapered protrusions extending from said light-receiving portion toward said LEDs, each of said tapered protrusions converging from said light-receiving portion toward said LEDs and having a pointed inner end distal from said light-receiving portion, and an outer end proximate to said light-receiving portion, each of said tapered protrusions further having a maximum width at said outer end thereof, which increases gradually from a middle portion of said light-receiving portion toward junctions of said light-receiving portion and said non-illuminated portion.