Abstract: An optical component includes a light-emitting surface and a bottom surface opposite to the light-emitting surface. The light-emitting surface and the bottom surface cooperatively form a negative lens portion, two first positive lens portions, and two second positive lens portions. The first positive lens portions and the second positive lens portions surround the negative lens portion and arranged in a stagger manner. The first positive lens portion have a first curvature, the second position lens portion have a second curvature smaller larger than the first curvature.

Abstract: An LED illumination device having two sides illumination includes a heat sink base, two LED illumination modules and two transparent boards. The heat sink base has a first heat sink base, a second heat sink base and a connecting element connected the first heat base and second heat sink base, wherein the first heat sink base is formed with a first accommodating space, the second heat sink base is formed with a second accommodating space opposite to the first accommodating space. The two LED illumination modules are mounted on the first accommodating space and the second accommodating space of the heat sink base respectively. And the two transparent boards are mounted on the first accommodating and the second accommodating space of the heat sink base to cover the two LED illumination modules.

Abstract: A LED lamp with double faces illumination includes a heat sink, two illumination modules and two lamp shades. The heat sink has a first surface, which has a first accommodating space and a second surface, which has a second accommodating space, the first accommodating space is formed with two first guide rails relatively on both sides of first accommodating space, the second accommodating space is formed with two second guide rails relatively on both sides of second accommodating space. The two LED illumination modules are arranged at the first accommodating space and the second accommodating space individually. And the two lamp shades are mounted on the first accommodating space and the second accommodating space individually to cover the two LED illumination modules.

Abstract: An LED illumination device capability of increasing illumination comprises a heat sink base, an LED illumination module which has a print circuit board and LEDS arranged at the print circuit board, a reflecting board and a transparent board. The LED illumination module is mounted on the heat sink base. The reflecting board has a plurality of holes which correspond to the LEDS of the LED illumination module, so that the LEDS may be exposed through the holes of the reflecting board. And the transparent board is located on the upper surface of the heat sink base to cover the LED illumination module.

Abstract: A liquid in pipeline and liquid level detection and warning system and some of its applications are provided. The liquid in pipeline and liquid level detection and warning system is incorporated into a liquid delivery unit. The liquid delivery unit includes a pipeline serially linking a liquid tank, a buffer tank and liquid outlet element. A drainage unit is also positioned under the outlet element for collecting redundant liquid. The warning and detection system includes a liquid in pipeline warning system and a liquid level warning system. The liquid in pipeline warning system has a first liquid in pipeline sensor installed on the pipeline between the buffer tank and the outlet element and a second liquid in pipeline sensor installed on the pipeline between the liquid tank and the buffer tank. The liquid level warning system has a first and a second liquid level sensor installed on the drainage unit such that the second liquid level sensor is positioned below the first liquid level sensor.