Abstract: A wide-angle LED warning apparatus has a heat sink base, a circuit board, multiple pillars, multiple LED devices and a transparent cover. The circuit board is mounted in the heat sink base. The pillars are formed in the heat sink base and each pillar respectively has an oblique surface, the oblique surfaces facing toward two opposite sides of the heat sink base. The LED devices mounted on a front surface of the circuit board and the oblique surfaces of the pillars. The transparent cover is mounted on the heat sink base. Hence, the LED warning apparatus of the invention can widely emit light due to the LED devices mounted on the oblique surfaces of the pillars to provide enhanced warning effect and security.

Abstract: A wide-angle LED warning apparatus has a heat sink base, a circuit board, multiple pillars, multiple LED devices and a transparent cover. The circuit board is mounted in the heat sink base. The pillars are formed in the heat sink base and each pillar respectively has an oblique surface, the oblique surfaces facing toward two opposite sides of the heat sink base. The LED devices mounted on a front surface of the circuit board and the oblique surfaces of the pillars. The transparent cover is mounted on the heat sink base. Hence, the LED warning apparatus of the invention can widely emit light due to the LED devices mounted on the oblique surfaces of the pillars to provide enhanced warning effect and security.

Abstract: An electronic starter for fluorescent lamp has a preheating circuit for controlling the preheating of the fluorescent tube and a power switch and locking circuit for cutting off the current to the preheating circuit. The power switch and locking circuit makes use of the voltage level on the power input to determine the status of the fluorescent tube. A high voltage on the power input represents that the fluorescent tube has failed to turn on in the ignition operation, whereby the power switch and locking circuit thereupon cuts off the current to the preheat circuit, thereby eliminating flickering of the fluorescent tube and so preventing irritation to the eyes, and extending the service life of the lamp.

Abstract: An electronic starter for fluorescent lamp has a preheating circuit for controlling the preheating of the fluorescent tube and a power switch and locking circuit for cutting off the current to the preheating circuit. The power switch and locking circuit makes use of the voltage level on the power input to determine the status of the fluorescent tube. A high voltage on the power input represents that the fluorescent tube has failed to turn on in the ignition operation, whereby the power switch and locking circuit thereupon cuts off the current to the preheat circuit, thereby eliminating flickering of the fluorescent tube and so preventing irritation to the eyes, and extending the service life of the lamp.