Apparatus and system for producing light using LED lighting with output within a predetermined desired color temperature range for commercial lighting uses which may be bicolor or may be multicolored. A preferred embodiment includes a first and second group of LEDs arranged in an alternating matrix configuration, each group of LEDs configured to produce light in a predetermined color temperature range. In a preferred embodiment, an LED light system includes a tubular LED lamp having substantially the same size and dimensions as a traditional fluorescent lamp tube and a control box for controlling power input and power gain to the first, second, or both groups of LEDs.

A light emitting diode, LED, filament arrangement (100) comprising at least one LED filament (120) comprising a plurality of light emitting diodes, LEDs, (140). The LED filament arrangement further comprises a plurality of first sections (180) and a plurality of second sections (200), wherein the plurality of first sections (180) is configured to emit light of a first colour temperature, CT.sub.1, and with a first intensity, I.sub.1, during operation, and the plurality of second sections (200) is configured to emit light of a second colour temperature, CT.sub.2, and with a second intensity, 12, during operation, wherein at least one of CT.sub.1CT.sub.2 and I.sub.1I.sub.2 is fulfilled, and wherein at least two second sections of the plurality of second sections are adjacently arranged and arranged at least partially parallel to each other.

A dual LED light fixture is comprised by a lower LED light source housing and an upper LED light source housing. A lower LED light source is mounted in the lower light source housing to generate downlight. An upper LED light source is mounted in the upper LED light source housing and remote from an outer circumferential light transmitting outer side area of the upper light source housing and from which is emitted side light illumination. An LED power supply and light control circuit mounted in the LED light fixture and adapted for connection to a power source. The LED light power supply and control circuit has a dimming circuit and a lower and upper driver current supply circuit. A switch is operative to connect driver current to the upper LED light source when actuated to an on position and to disconnect driver current to the upper LED light source when in a normal off position. The switch is operative for engagement to its on position when desirable to provide drive current to the upper light source and illumination from both the lower and upper LED light sources of the LED light fixture. Various embodiments of the LED light fixture is described.

A flexible light emitting diode (LED) sheet operable to (i) produce light, (ii) enhance an amount of light and/or connected light-emitting diodes and/or sheets that can be daisy chained together, and (iii) lower wattage consumption. Lighting options include single color, color changing lighting, and pixel lighting.

A light assembly includes a housing, a light emitting diode (LED), and a hemispherical dome. The housing has a lens mounted thereon. The light LED is mounted within the housing and operable to emit light within a predetermined range of wavelengths and at an emission intensity toward the lens. The hemispherical dome mounted is within the housing between the LED and the lens. The hemispherical dome comprises a material that attenuates the emission intensity by a predetermined magnitude, and has an aperture formed therein and through which a portion of the light emitted from the LED may pass unattenuated.

There is described a color-changing LED bulb in the LED bulb technical field. The bulb has light-emitting components, under which electrified components are mounted. The outer surface of the light-emitting component is covered by a lampshade. The light-emitting component includes a component loading board with a protective cover on the outer side. The power cord stretches out of the bottom of the loading board and is connected to electrified components. Capacitors are also mounted at the bottom of the loading board. This color changing LED bulb controls the power supply to the beads via a chip bridge rectifier, chip resistor, and IC chip. If the switch is flipped, the chip bridge rectifier detects if power is supplied. By connecting the 3 different IC chipsU1, U2 & U3, U1 chip controls the U2 & U3 IC chip to electrify the beads of different colors. Each time that the switch is operated (flipped), a different color is displayed.

A light source unit includes light-emitting elements, a light-shielding body, and a rod lens including a first end surface, a second end surface, and a side surface. The light-shielding body is separated from the side surface, covers the side surface, includes an opening exposing at least a portion of the second end surface, and includes a tip protruding further than the second end surface in a first direction from the first end surface toward the second end surface. A first plane crosses the first direction and is at the same first-direction position as the tip. A second plane crosses the first direction and is at the same position as the second end surface or between the tip and second end surface in the first direction. A first surface area of the opening at the first plane is greater than a second surface area of the opening at the second plane.

A lighting fixture includes a frame, one or more LED light sources to emit radiation, control circuitry to receive AC power and control the one or more LED light sources, and a coolant pipe to carry a fluid coolant. The lighting fixture further includes a tube and end caps that together form an enclosed cavity to contain the frame, the LED light sources, and the control circuitry. In example implementations, the tube does not physically contact the frame, the LED light sources, and the control circuitry. The cavity may further contain air, gas, or vacuum that forms a thermal barrier between the tube and the LED light sources to reduce heat dissipation from the LED light sources to the environment. The tube may further enable the lighting fixture to be rotatably and/or translationally adjustable relative to a support structure after installation in a close proximity grow system.

An assembly of electronic semiconductor components includes a carrier, at least one optoelectronic semiconductor component, a varactor component and a receiving element. The optoelectronic semiconductor component, the varactor component and the receiving element are arranged on the carrier. The optoelectronic semiconductor component and the varactor component are formed with the same semiconductor material. The optoelectronic semiconductor component has an active region configured for emitting electromagnetic radiation. The varactor component together with the receiving element forms a tunable resonant circuit. The resonant circuit is configured to draw energy for operating the optoelectronic semiconductor component from an alternating electromagnetic field.

A multi-function lighting apparatus comprising a support structure, a light engine mounted on the structure, and a control unit controlling the light engine; the light engine comprising a first group of warm LEDs having color temperature ranging between 2000 and 2500 K and color rendering index ranging between 85 and 95; and a second group of cold LEDs having color temperature of at least 5000 K and color rendering index ranging between 65 and 75; the control unit being a two-channel driver control unit which controls independently the warm LEDs and the cold LEDs and is configured to control the light engine to emit white light with variable color temperature and luminous flux according to at least three different modes performing a lighting function, a plant maintenance function, and a sanification function respectively, as the color temperature and the luminous flux emitted by the light engine vary.