Materials and lightguides formed thereof that are suitable for use in lighting units to impart a color filtering effect to visible light. At least a portion of such a lightguide (16) is formed of a composite material comprising a polymeric matrix material and an inorganic particulate material that contributes a color filtering effect to visible light passing through the composite material, and the particulate material comprises a neodymium compound containing Nd.sup.3+ ions.

of the Invention. Disclosed herein an apparatus for mimicking the light and sky-conditions at the horizon comprises a light assembly (2) provided with at least two angularly disposed horizontal strips (9a and 9b) of light source, a composite lens (5) fixedly placed above the light assembly (2) and configured to selectively reflect and transmit the light incident on it, a reflecting dome (3) centrally and partially disposed over the composite lens (5) and light assembly module (2) and provided with an LED spotlight (12) under it, a mounting bracket (4) adapted to receive the light assembly and the composite lens; and a controller (11) configured to control and monitor one or more predetermined parameters of the light source (9), wherein the characteristic of the composite lens (5) is translated depending on the desired geographical location. A corresponding method for mimicking the light and sky-conditions at the horizon is also disclosed.

The present disclosure discloses a light source device. The light source device comprises a light source array configured to emit an excitation light; a phosphor sheet arranged in a propagation direction of the excitation light and configured to receive the excitation light to emit an excited unsaturated amber light; and a cutoff filter arranged along a propagation direction of the unsaturated amber light and configured to filter the unsaturated amber light to obtain a saturated amber light.

An optical system for adjusting a proportion of light of a particular spectral band that is emitted from the optical system. A dichroic mirror is configured to reflect light of a first spectral band from a light source towards a distal end of an optical fiber while allowing light of a second spectral band to pass through the dichroic mirror. The second mirror is positioned behind the dichroic mirror and is configured to reflect light of the second spectral band. A mirror actuator is coupled to the second mirror and is configured to adjust a proportion of the light of the second spectral band that is emitted by the optical system by adjusting a position of the second mirror relative to the dichroic mirror.

The present disclosure describes light systems in which the intensity of base color LEDs configured to emit light within a target color region is increased using additional white LEDs and the emitted light is filtered so that a dominant portion of light passing through the filter at a particular viewing angle is within the target color region. The present disclosure also describes methods for forming a printed circuit board with an integral heat sink arrangement by depositing additional solder on solder pads that are not used to connect electronic components so that the additional solder acts as a heat sink.

The invention relates to a flashlight device comprising at least one unit for generating flashlight and at least one unit for focusing the generated flashlight. The invention further relates to methods for the use thereof and to a set comprising at least one flashlight device according to the invention and a light-curable material, and to a device.

A luminaire includes a white light LED light source emitting a light beam that that is filtered by first and second color filters. An optical device modifies the filtered light beam. A control system receives a commanded value for the optical device and responds by causing the optical device to move based on the commanded value; determining a Duv change in the light beam caused by the optical device; determining positions for the color filters based on the Duv change, a current correlated color temperature (CCT) isotherm value, and a current Duv value; and moving the color filters to their determined positions. The control system may alternatively receive a command with a Duv value and respond by determining color filters positions based on the received Duv value and a current CCT isotherm value; and moving the color filters to their determined positions.

A luminaire includes a white light LED light source emitting a light beam that that is filtered by first and second color filters. An optical device modifies the filtered light beam. A control system receives a commanded value for the optical device and responds by causing the optical device to move based on the commanded value; determining a Duv change in the light beam caused by the optical device; determining positions for the color filters based on the Duv change, a current correlated color temperature (CCT) isotherm value, and a current Duv value; and moving the color filters to their determined positions. The control system may alternatively receive a command with a Duv value and respond by determining color filters positions based on the received Duv value and a current CCT isotherm value; and moving the color filters to their determined positions.

An aeronautical light aid for a vertical takeoff and landing (VTOL) flying object is provided. The aeronautical light aid includes a plurality of first lighting portions buried in a takeoff and landing port and configured to radiate light in a vertically upward direction, a plurality of second lighting portions provided on an outer side of the takeoff and lighting port and configured to radiate light in an externally upward direction, and a landing guide provided at the center of the takeoff and landing port.

A lighting apparatus to be installed in an area adjacent to land is provided. The lighting apparatus includes a plurality of light sources disposed on a board and further includes a light shield. The light shield blocks a portion of light emitted from the light sources. The portion of light has a predetermined wavelength. The light shield is disposed on the board closer to the land than at least a light source disposed closest to the land among the light sources. The light shield has a shape which sends, to the land, first emission light included in the light emitted from the light sources. The shape avoids sending, to the land, second emission light included in the light emitted from the light sources. The first emission light passes through the light shield. The second emission light does not pass through the light shield.