Patent 7510299 was granted and assigned to Altair Engineering Inc on March, 2009 by the United States Patent and Trademark Office.
A light tube for replacing fluorescent tubes including a bulb portion and a pair of end caps disposed at opposite ends of the bulb portion, and configured for illumination by a power supply circuit. A plurality of light emitting diodes are disposed inside the bulb portion and in electrical communication with a pair of end caps for illuminating in response to electrical current to be received from the power supply circuit.