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Colour sequential lighting device

A technology for lighting devices and cooling devices, which is applied in the direction of lighting devices, components of lighting devices, cooling/heating devices of lighting devices, etc., and can solve problems such as frequency dimming

Active Publication Date: 2014-12-10
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US2009 / 0187234 further proposes to use Pulse Width Modulation (PWM) of the current for LEDs to adjust the color spectrum, thus dimming certain frequencies

Method used

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  • Colour sequential lighting device
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Examples

Experimental program
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Embodiment Construction

[0029] A lighting device is provided comprising a plurality of LEDs, such as at least two LEDs, arranged in a configuration such that a movable member comprising a plurality of translucent portions can be positioned and moved relative to the LEDs such that light emitted from the LEDs Transmission through multiple translucent sections. Some of the translucent parts are provided with wavelength converting materials such that the wavelength of light transmitted therethrough is converted. The movable part moves at such a speed that the different wavelengths of light are perceived by the human eye as a single color of light without any noticeable flickering. A control unit connected to the lighting device is adapted to control the input power supplied to the individual LEDs, eg by means of pulse width modulation, such that certain LEDs can be dimmed. The sequential timing between the movement of the movable part comprising multiple parts and the pulses of power supplied to the ind...

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PUM

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Abstract

Lighting device (1) comprising a plurality of LEDs (2a - 2h) and a movable member (3) comprising a plurality of translucent segments (S1 - S8) arranged such that the light from the LEDs (2a - 2h) is transmitted therethrough. At least one of the translucent segments (S1 - S8) comprises a wavelength conversion material. The lighting device (1) further comprises a control unit (5) for adjusting the color of the light emitted from the lighting device by controlling the power supplied to each one of the LEDs (2a - 2h) in correspondence to the movable member (3), and by controlling the total power supplied to the lighting device (1) independently from the power supplied to each one of the plurality of LEDs (2a - 2h).

Description

technical field [0001] The present invention generally relates to lighting devices with enhanced color spectrum or adjustable color spectrum. Background technique [0002] Light emitting diode (LED) lighting fixtures are a rapidly growing segment of lighting fixtures, which have the advantage of providing high lumen output per unit of energy due to their high efficacy. Additionally, LED lighting fixtures are durable and robust, which contributes to the environmental advantages of LED technology. [0003] One of the shortcomings of conventional LED technology is that the LED itself typically emits light within a relatively narrow spectrum, thus altering the color of the illuminated surface compared to the perceived color of the daylight-lit surface, which is often taken as a reference . [0004] Various solutions have been proposed to enable lighting devices based on LED technology to better simulate daylight, ie to increase the spectral content of the emitted light. These...

Claims

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Application Information

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IPC IPC(8): H05B33/08F21S10/02G02B26/00F21S10/00H05B44/00F21V9/40
CPCF21S10/007F21S10/02G02B26/008F21K9/64F21K9/65F21Y2115/10F21Y2113/13F21V9/45H05B45/20F21V29/74F21V14/08F21Y2115/30
Inventor A·J·S·M·德瓦安
Owner SIGNIFY HLDG BV
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