Koninklijke Philips Corporation N.V.

Philips Lighting Holding B.v.

Fudan University

Wenyi Li

Shitao Deng

Xiaoyan Zhu

Miao Zhang

Chuan Yuan

Muqing Liu

Xiaoli Zhou

Wanlu Zhang

Wenting Cheng

There is provided a lighting apparatus and a method for reducing discomfort glare. The method comprises a step of providing a first portion of light radiation in a first incident angle range; and another step of providing a second portion of light radiation in a second incident angle range consecutive to the first incident angle range. The first incident angle range is greater than the second incident angle range viewed from a vertically downward direction of a light source emitting the light radiation, and the correlated color temperature of the first portion of light radiation is lower than that of the second portion of light radiation.

Lighting apparatus and method for emitting light having different color temperatures

The invention discloses a lighting device for a road lighting luminaire and a lighting luminaire comprising the lighting device. The lighting device comprises a reflector (), which comprises a reflecting surface () formed by revolving a parabolic curve around a first axis (y) through a predetermined angle, wherein said parabolic curve has an aperture at its vertex, said first axis axis being co-planar with said parabolic curve, and extending substantially perpendicularly to the axis (x) of symmetry of said parabolic curve, and being located at or outside of said aperture of said parabolic curve. The lighting device further comprises a LED light source (), which is disposed at an entry to said reflecting surface, with said entry corresponding to said aperture of said parabolic curve. In this way, light distribution can be controlled in the same way in any plane containing the first axis within the range of the predetermined angle. Moreover, the light distribution in any plane containing the first axis (y) can be controlled as desired by designing the parabolic curve accordingly. Thus, the lighting device can effectively reduce or eliminate the negative glaring effect and/or achieve satisfying lamination uniformity on the road surface.

Lighting device and a road lighting luminaire comprising the lighting device

The invention proposes a lighting device (). The lighting device () for road lighting comprises a lighting module and a control module coupled to the lighting module, and configured to control the lighting module to radiate a first light beam () towards a first direction to generate a first lighting pattern on the road surface (B), when a first predetermined condition is satisfied, and to control the lighting module to radiate a second light beam () towards a second direction to generate a second lighting pattern on the road surface (A), when a second predetermined condition is satisfied, wherein the first direction is oriented to go along the traffic direction and the second direction is oriented to go opposite the traffic direction.

Lighting device, a method of controlling the same, for selectively emitting light along or against traffic direction

This invention belongs to the luminous flux measurement field, and especially relates to the equipment and method for LED's total luminous flux measurement with a narrow beam standard light source. The system for LED's total luminous flux measurement with a narrow beam standard light source in this invention comprises an integrating sphere, the light source, a narrow aperture fiber, a spectrometer and a driver for the light source. The light source is lighted by the driver. The narrow beam standard light source (both luminous flux standard and spectrum standard) is placed on the interior surface of integrating sphere, there is not any baffle in the sphere, and a narrow aperture fiber transfers the light to a multi-channel spectrometer which measures the spectrum distribution of LED and calculates its total luminous flux. The equipment in this invention is easy to use, has small error and low cost, and can achieve accurate results for LED's total luminous flux.

Equipment and method for LED's total luminous flux measurement with a narrow beam standard light source

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Shanghai, China

Wenyi Li