The invention provides an elongated luminescent body (100) comprising an elongated support (170) and a coating layer (180), wherein the elongated luminescent body (100) further comprises a body axis (BA), and a length parameter P of a body dimension perpendicular to the body axis (BA), wherein the length parameter P is selected from height (H), width (W) and diameter (D), wherein: —the elongated support (170) comprises a support material (171), a support material index of refraction n1, wherein the support material index of refraction n1 is at least 1.4, a support surface (172), and a support length (L1); —the coating layer (180) is configured on at least part of the support surface (172) over at least part of the support length (L1), wherein the coating layer (180) comprises a coating layer material (181), a coating layer index of refraction n2, wherein coating layer index of refraction n2 is at least 1.4, and a coating layer thickness (d1), wherein the coating layer material (181) has a composition different from the support material (171), wherein the coating layer material (181) comprises a luminescent material (120) configured to absorb one or more of UV radiation and visible light, and to convert into luminescent material light (8) having one or more wavelengths in one or more of the visible and the infrared; and —the support material (171) is transmissive for the luminescent material light (8), and (i) −0.2≤n1−n2≤0.2 and (ii) d1/P≤0.25 apply.

According to aspects of the embodiments, a lighting fixture is designed to help prevent the accumulation of snow or ice on the light emitting face {e.g., lens) of the lighting fixture. The lighting fixture harvests both the light and heat generated by at least one light source, such as but not limited to at least one LED light source. The lighting fixture adopts a flip-mount light source mounting design in which one side of a passive heat exchanger is mounted or secured closely adjacent or proximate to the lens, and the light source is mounted or secured to another side of the passive heat exchanger. The heat generated by the light source is conducted by the passive heat exchanger to heat the lens. Additionally, the light emitted from the light source is redirected back through the passive heat exchanger and to the lens using a bundle of light fiber cables.

This invention presents a solar light collecting and guiding system for stabilizing the output light intensity, wherein the system comprising an array of converging lenses and optical fibers for collecting light focused by converging lenses. The fibers and the lenses are in one-to-one correspondence wherein the input end of an optical fiber is located in the focus position of the corresponding converging lens, and the axis of the optical fiber overlaps with the principal axis of the corresponding converging lens. The system is equipped with a sunlight tracking positioning device for synchronized motion, wherein the device is applied to tracking the sun light ray vertical incident into the central converging lens. The system has the function of outputting stable light intensity, that is, it can effectively reduce the variation of the collecting efficiency caused by the positioning deviation between the incident angle of sunlight and the designed input angle.

The invention provides an elongated luminescent body (100) comprising an elongated support (170) and a coating layer (180), wherein the elongated luminescent body (100) further comprises a body axis (BA), and a length parameter P of a body dimension perpendicular to the body axis (BA), wherein the length parameter P is selected from height (H), width (W) and diameter (D), wherein:—the elongated support (170) comprises a support material (171), a support material index of refraction n1, wherein the support material index of refraction n1 is at least 1.4, a support surface (172), and a support length (L1);—the coating layer (180) is configured on at least part of the support surface (172) over at least part of the support length (L1), wherein the coating layer (180) comprises a coating layer material (181), a coating layer index of refraction n2, wherein coating layer index of refraction n2 is at least 1.4, and a coating layer thickness (d1), wherein the coating layer material (181) has a composition different from the support material (171), wherein the coating layer material (181) comprises a luminescent material (120) configured to absorb one or more of UV radiation and visible light, and to convert into luminescent material light (8) having one or more wavelengths in one or more of the visible and the infrared; and—the support material (171) is transmissive for the luminescent material light (8), and (i) −0.2≤n1−n2≤0.2 and (ii) d1/P≤0.25 apply.

This invention presents a solar light collecting and guiding system for stabilizing the output light intensity, wherein the system comprising an array of converging lenses and optical fibers for collecting light focused by converging lenses. The fibers and the lenses are in one-to-one correspondence wherein the input end of an optical fiber is located in the focus position of the corresponding converging lens, and the axis of the optical fiber overlaps with the principal axis of the corresponding converging lens. The system is equipped with a sunlight tracking positioning device for synchronized motion, wherein the device is applied to tracking the sun light ray vertical incident into the central converging lens. The system has the function of outputting stable light intensity, that is, it can effectively reduce the variation of the collecting efficiency caused by the positioning deviation between the incident angle of sunlight and the designed input angle.

A lighting system includes a light source unit and a light-distributing member. The light source unit includes a laser light source. The light-distributing member has the function of reflecting incident light that has been emitted as a beam of light from the light source unit toward a target space. The light-distributing member transforms the incident light into lighting light having a different light distribution property from the incident light and distributes the lighting light over the target space.

A method is provided for the production of a lighting device, and the lighting device is also provided for lighting an interior. The device has at least one cylindrical longitudinal segment, at least one lateral segment that extends away from the longitudinal segment, and at least one light source. The at least one longitudinal segment has at least one light entry surface along its length, and at least one light transfer region through which light is conducted into the lateral segment. The at least one lateral segment is flat, and contains at least one light-conducting fiber through which light is emitted into the interior. The at least one light-conducting fiber is materially bonded to the at least one longitudinal segment to form the light transfer region. This results in a simple, quick and inexpensive production, with a mechanically durable connection, which results in a homogenous light distribution.

According to aspects of the embodiments, a lighting fixture is designed to help prevent the accumulation of snow or ice on the light emitting face (e.g., lens) of the lighting fixture. The lighting fixture harvests both the light and heat generated by at least one light source, such as but not limited to at least one LED light source. The lighting fixture adopts a flip-mount light source mounting design in which one side of a passive heat exchanger is mounted or secured closely adjacent or proximate to the lens, and the light source is mounted or secured to another side of the passive heat exchanger. The heat generated by the light source is conducted by the passive heat exchanger to heat the lens. Additionally, the light emitted from the light source is redirected back through the passive heat exchanger and to the lens using a bundle of light fiber cables.

An illumination apparatus includes an outer tube, an inner tube, and a light source. The outer tube has a reflecting inner wall. The inner tube is disposed in the outer tube and coaxial with the outer tube. The inner tube has a reflecting outer wall. A ring-shaped light channel is formed between the outer tube and the inner tube. The ring-shaped light channel has a light entrance and a light exit corresponding to two ends of the outer tube respectively. A segment of the inner tube protrudes from the light exit. The light source is disposed at the light entrance. A light beam emitted from the light source enters the ring-shaped light channel through the light entrance, is reflected multiple times by the reflecting inner wall of the outer tube and the reflecting outer wall of the inner tube, and travels out of the illumination apparatus through the light exit.

An electrical device includes a circuit board (101), a light source (104), and a light guide (105). The light guide receives light from the light source and conducts the received light to an end of the light guide so that the light crosses, in a direction parallel with the circuit board, an edge of the circuit board. The end of the light guide constitutes a display surface for showing the light to a user. On a fringe area extending from the edge of the circuit board a distance (D) towards the opposite edge of the circuit board, the light guide is between geometrical planes parallel and coinciding with surfaces of the circuit board. Hence, the light guide does not require room in directions perpendicular to the circuit board. Therefore, for example, more connectors, key buttons, and/or other instruments can be placed on a control panel of the electrical device.