Advancements in LED Lighting Distribution Techniques

Tunable white light LED device that provides high-quality light with adjustable color temperature and enhanced color rendering for applications like circadian lighting. It uses a combination of three LED strings (blue LEDs with phosphor coatings), each with a different color phosphor, to generate unsaturated light of different colors. These unsaturated light spectra are mixed to create a tunable white light that can be adjusted along the black body locus of correlated color temperatures. The device uses a drive circuit to adjust the relative currents to the LED strings and achieve the desired color point.

An LED lighting system that provides efficient, glare-free illumination with adjustable color and directionality to replace fluorescent tubes. The system uses multiple LEDs mounted on a transparent support structure. Reflectors redirect light emitted in undesirable directions toward the desired illumination direction. Phosphors on the support structure homogenize the LED colors for a consistent appearance.

UV LED sweeping device that enhances UV radiation dosage and coverage area for applications like sterilization, disinfection, curing, and phototherapy. It uses a rotating polygonal mirror to sweep UV light emitted by a bundled UV LED array. The mirror changes the direction of the beam, expanding it into a larger sectorial region. This allows efficient and uniform irradiation over a wider area compared to fixed UV LEDs.

An adjustable lighting fixture that maintains high light output even when angled. The fixture has an adjustment module that slides horizontally as it tilts to keep the center of the light beam pointed at the ceiling opening. This allows the module to be tilted without blocking part of the light cone. The module pivots on spring-loaded brackets that hold it in position. The brackets also act as sway bars to guide the module's motion and counterbalance its weight.

Surface illumination device that reduces flicker, eye strain, and fatigue. The device emits light that is directed away from the user's line of sight. This is achieved by configuring the light distribution so that the maximum intensity angle of light emitted from the center of the device's light-emitting surface is within -90° to <0° in a plane perpendicular to the surface. This avoids direct perception of the light and reduces flicker perception.

Improving the uniformity of light dispersion from horticulture grow light fixtures to deliver more uniform light across a target area and reduce hotspots. This is achieved by rearranging the positioning of the individual LEDs or light emitters so that a greater density of light emitters is used near the edges of the fixture versus the center. By projecting higher levels of light near the edges it brings more light to the periphery and reduces the difference between edge and center light levels.

LED filament bulb with omnidirectional light emission and high efficiency. The bulb uses a flexible LED filament shaped to emit uniform light in all directions. The filament has multiple flat segments connected by bendable sections. This allows the filament to be shaped in a non-linear configuration compared to traditional straight filaments. The shaped filament emits light uniformly in 360 degrees. The bendable segments prevent disconnection when the filament is flexed.

Light emitting diode (LED) array with a window that shapes and focuses the light in a way that minimizes variations in intensity across the beam angle. The LED array has a matrix of closely spaced LED chips on a substrate. A dome-shaped window covers the LEDs and controls their emitted light paths. The window has a convex lens shape with a height of 70% or less than its lower diameter. This concentrates the light within a 90-degree beam angle while reducing peaks and valleys in the light profile

White LED lighting that closely mimics natural sunlight and has improved color rendering compared to traditional LEDs. The device uses broad-spectrum blue LEDs as the excitation source along with optimized green-yellow and red phosphors. The broad blue excitation fills in the cyan trough between blue and green phosphors, boosting color rendering. The result is full-spectrum white light that appears more natural, has higher CRI, and reduces eye damage from excessive blue light exposure.

LED lamp design to improve color rendering by using a combination of white LEDs and purple LEDs. The purple LEDs emit in the UVA spectrum. The white LEDs provide the main light output while the purple LEDs fill in the UVA range. The combined light enhances color rendering compared to just white LEDs. Alternating white and purple LEDs allows overlap of the UVA range. The purple LEDs can be 400-420nm wavelength.

LED lighting device design that improves light output and color consistency over different angles. The design uses a lens assembly mounted over the LED, with a gap between the lens and elastomer encapsulant. This allows light to reflect off the lens surfaces instead of being absorbed by the elastomer. A reflector in the gap can further control light direction. The lens can also have features like a recess or scattering element to mix light. This reduces color variations and improves uniformity compared to traditional LED encapsulation.

Lighting apparatus with improved luminance using LEDs and reflectors, without increasing thickness or light sources. A reflective unit with a spaced area under each LED increases reflectivity and luminance. The spaced area can be defined by an optical pattern layer to replace a light guide plate.

Backlight module for displays that uses magnet attraction between adjacent lamp plates to reduce visible gaps. The backlight module includes a back plate, lamp plates, diffuser plate, optical films, and magnetic attraction parts. The lamp plates are magnetically attracted to the back plate to reduce gaps between them when stacked. This improves display quality by minimizing visible seams between lamp plates.

A hybrid lighting and communication system that uses an orange nanowire LED combined with a blue laser diode for high-speed communication. This allows tunable white lighting with high color rendering and also optical wireless data transmission. The orange nanowire LED emits broad-spectrum white light with good color rendering. The blue laser provides high-speed communication capability. The combined LED/laser system enables both illumination and data transmission using visible light.

A lighting system for plant growth that provides precise control over light color to optimize plant growth. The system uses LEDs of different colors to create tailored light spectra optimized for specific plants and growth stages. A controller adjusts the intensity of each LED color based on external light sensors to mimic natural lighting conditions.

A display apparatus that mitigates bias in light intensity distribution from individual light emitting elements to achieve uniform overall display illumination. The display uses an array of light emitting units, each composed of multiple light emitting elements with different wavelengths. The light emitting elements within each unit are arranged to compensate for their individual intensity biases. This arrangement involves orienting the elements such that their biased intensity distributions align in one direction but cancel out in the orthogonal direction. The overall display intensity distribution is then uniform due to complementary biases.

LED lighting with optimized color spectrum for enhanced color preference compared to standard LED sources. It uses a metric called Lighting Preference Index (LPI) as a quantitative measure to design light sources with maximum color preference. The optimized composite light sources contain blue, green/yellow-green, and red emitters or downconverters in specific wavelength ranges to achieve LPI of at least 120. These optimized LED spectra provide significantly higher color preference than standard LEDs.

An eye-safe light source that improves the light emission efficiency while regulating light distribution characteristics. The light source includes a semiconductor laser joined to a substrate with the wire perpendicular to the laser emission direction. The substrate has a curved reflection surface that faces the laser emission end to reflect the laser light. This avoids shadows and scattering bodies between the laser and reflector.

A controlled linear LED light source for sorting machines that enhances imaging capability and sorting performance. The light source uses a modular LED illuminator with individual LED control that allows temporal, spatial, and spectral control of the light emitted. An external diffuser renders the light uniform. A computer network controls the LEDs to generate a multi-modal, multi-spectral light output with characteristics optimized for imaging and sorting.

LED light emitting device that combines multiple LED sources into a compact high quality light source. The device uses a single light guide element adjacent to the LED output surfaces to efficiently collect the emitted light and guide it to an output surface. A transparent collimating element captures the guided light and reflects any escaping light back into the guide.