CN101653042B - 带稳定色温光源的可调光设备的色调变化 - Google Patents

带稳定色温光源的可调光设备的色调变化 Download PDF

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CN101653042B
CN101653042B CN200880008301.1A CN200880008301A CN101653042B CN 101653042 B CN101653042 B CN 101653042B CN 200880008301 A CN200880008301 A CN 200880008301A CN 101653042 B CN101653042 B CN 101653042B
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约翰·L·梅兰松
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    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
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    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
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    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
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    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract

允许一个包含具有多种色温的光源照明装置改变色温以响应调光水平变化的一种方法和系统。此光源为非白炽灯光源，例如发光二极管和/或气体放电光源。调光电路提供指示所选调光水平的调光信号。照明装置包括一个光源激励器和一个光源激励器控制器，它们联合改变光源的驱动电流以响应所选的调光水平。通过以不同相对量改变驱动电流，从而，根据调光水平变化改变照明装置的色温。在至少一个实施例中，照明装置响应调光水平改变而产生的色温变化促使白炽灯光源的色温改变。

Description

带稳定色温光源的可调光设备的色调变化
对相关专利申请的交叉引用
本专利申请要求依据35U.S.C.§119(e)和37C.F.R.§1.78享有2007年3月12日递交的名为“照明器材”的60/894,295号美国临时专利申请的权益。60/894,295号美国临时专利申请内包含示范性系统和方法，在此通过引用将其整体纳入。
2007年3月31日递交、发明人为John L.Melanson、代理人档案编号为1666-CA-PROV、名为“发光二极管光源镇流器”的美国专利申请描述了示范性方法和系统，在此通过引用将其整体纳入。
2007年3月31日递交、发明人为John L.Melanson和John Paulos、代理人档案编号为1668-CA-PROV、名为“多功能占空比调节器”的美国临时专利申请描述了示范性方法和系统，在此通过引用将其整体纳入。
2007年3月31日递交、发明人为John L.Melanson和John Paulos、代理人档案编号为1669-CA、名为“带照明调光器输出映射的照明系统”的美国专利申请描述了示范性方法和系统，在此通过引用将其整体纳入。
技术领域
本发明大致与电子学和照明领域有关，具体而言，是一种使用稳定色温光源的可调光照明装置的色调变化系统和方法。
背景技术
商业上实用的白炽灯已有逾百年的历史。然而，其它光源也显示出成为具有商业可行的白炽灯泡替代品的潜力。气体放电光源如荧光灯、水银灯、低压钠灯和高压钠灯，以及场致发光光源如发光二极管(LED)，它们代表两类可以替代白炽灯的光源。作为一种主流光源，LED变得格外有吸引力，其中，部分原因是由于其能够通过高效率的光输出实现节能，并且有利于环保，例如减少了水银的使用。
白炽灯通过让电流流过真空灯泡中的金属丝发光。电流使金属丝发热并发光。当越多的电流流过金属丝时，金属丝产生的热量也就越多。对于一个透明的真空灯泡，金属丝的温度决定了光的颜色。较低的温度会产生淡黄色的光，高温会产生较蓝、较白的光。
气体放电灯包含一个封住气体的外罩。外罩末端有两个电极。电极通电后，两个电极间会产生电压差。通电电极放热使封入的气体电离。电离气体发出光。荧光灯中含有水银蒸汽，水银蒸汽发出紫外光。荧光灯外罩内部包含一层可以将紫外光转化为可见光的磷光层。
LED为半导体装置，由直流电驱动。LED的流明输出强度(即亮度)与通过LED的电流强度成正比。因此，提高供给LED的电流强度可提高LED的流明输出强度，降低供给LED的电流强度可使LED变暗。电流的调整有两种方式，一种是直接降低供给白色LED的直流电水平，另一种是通过脉冲宽度调制降低平均电流。
通过光的颜色特性可测定可见光谱的功率分配。可见光谱的波长范围约为400纳米(紫光)到700纳米(红光)。光的颜色特性通常用色温定义。因此，虽然光源发出的光的能量分布于多个频率，但是它被认为具有特定的颜色，此颜色可用特定的色温定义。表1描述了特定光源与其色温之间的一种示范性关系。
光源 色温(开尔文)
天空光(蓝天) 12,000-20,000
夏季平均色度 8000
夏季浅色度 7100
夏季代表性色度(太阳+天空) 6500
日光荧光灯 6300
短弧氙灯 6400
阴天 6000
透明水银灯 5900
阳光(中午，夏季，中纬度地区) 5400
设计用白色荧光灯 5200
用于颜色评定的特殊荧光灯 5000
照相用日光泛光灯 4800-5000
阳光(清晨和傍晚) 4300
亮白色豪华水银灯 4000
光源 色温(开尔文)
阳光(破晓后1小时) 3500
冷白色荧光灯 3400
照相用泛光灯 3400
专业钨摄影灯 3200
100瓦卤钨灯 3000
豪华暖白色荧光灯 2950
100瓦白炽灯 2870
40瓦白炽灯 2500
高压钠灯 2100
阳光(日出或日落) 2000
蜡烛火焰 1850-1900
火柴火焰 1700
表1
在使用光源的环境中调暗光源不仅可以节能，还能让使用者将光源亮度调至要求的水平。许多设施如住房和建筑物等，都安装有光源调节电路(以下简称“调光器”)。
图1描述了具有常规调光器102的照明电路100，此调光器用于调节白炽灯光源104以响应对可变电阻器106的输入。调光器102、光源104和电压源108为串联。电压源108在线电压Vline时提供交流电。线电压Vline可随地理位置而变。线电压Vline通常为110-120V或220-240V，典型频率为60Hz或70Hz。调光器102打开和关闭光源104，并且会每秒开关许多次，以减少供给光源104的电能总量，而不是将光源104的电能转移到电阻器中。使用者可以选择可变电阻器106的电阻值，从而调节电容器110的充电时间。将可变电阻器106设为0欧姆时，由第二个固定电阻器112提供最低电阻。当电容器110的电压充到高于双向触发二极管114的触发电压时，双向触发二极管114导电，三端双向可控硅116的栅极充电。三端双向可控硅116栅极处的电压和偏压电阻器118两端电压的合成电压使三端双向可控硅116导电。当电流I通过零线时，三端双向可控硅116不导电，即断开。当三端双向可控硅116不导电时，调光器输出电压VDIM为0V，当三端双向可控硅116导电时，调光器输出电压VDIM与线电压Vline相等。将电容器110的电压充到足以触发双向触发二极管114所需的充电时间取决于电流I的值。电流I的值由可变电阻器106和电阻器112的电阻值决定。因此，通过调节可变电阻器106的电阻值可以调节调光器输出电压VDIM的相角。调节调光器输出电压VDIM的相角相当于调节调光器输出电压VDIM的相角。通过调节调光器输出电压VDIM的相角可以调节向光源104提供的平均功率，从而调节光源104的亮度。
图2描述了光谱功率分布图200，此图代表了白色LED、绿色LED和白炽灯光源的可见光谱在高低驱动电流中的光谱功率分配变化。通过降低供给光源的驱动电流强度可降低光源的亮度。调节白炽灯光源的亮度会导致光谱频率分配发生显着改变，从而，引起色温的显着变化。例如，将100W白炽灯的亮度调低至全亮度的75％会使光的颜色从青白色变为一种暗黄色，例如琥珀色。通过降低供给一种LED的电流强度，例如绿色和白色LED，可降低LED的亮度，但是其光谱功率分布基本保持不变。因此，LED的色温变化很小。气体放电光源的特性在各种调光水平上都与LED非常相似。
图3描述了非白炽灯光源的调光水平与色温之间图形关系300。通过改变非白炽灯光源的组合，可以改变具有非白炽灯光源的照明装置的色温。但是，不论照明装置中的非白炽灯光源的组合如何，通过改变照明装置的调光水平而改变的是光源的亮度而不是照明装置的色温。
虽然可以调节具有一个或多个非白炽灯光源的照明装置，但是调节非白炽灯光源不能产生与白炽灯光源相似的色温改变。
发明内容
本发明的一个实施例中，照明装置包括两个用于接收来自调光器和交流(AC)电源的调光信号的输入端子，其中，调光信号指示了调光水平。此照明装置还包括一个拥有稳定第一色温的第一光源和一个拥有稳定第二色温的第二光源.此照明装置还包括一个光源激励器，此光源激励器与第一光源和第二光源相连，并与输入端子相连，以向第一光源提供第一驱动电流以及向第二光源提供第二驱动电流。此照明装置还包括一个光源激励器控制器，此光源激励器控制器与光源激励器相连，以使光源激励器改变第一和第二驱动电流，对调光信号指示的调光水平的改变作出响应，其中改变第一和第二驱动电流会改变照明装置的色温。
本发明的另一实施例中，一种改变照明装置色温的方法包括至少用N个输入端子中的一个接收调光信号，其中，调光器输入信号指示了一段时间内的多个调光水平，N为小于等于四(4)的正整数，并包括至少用N个输入端子中的两个接收来自电压源的功率。此方法还包括向第一光源提供一种第一驱动电流，其中，第一光源拥有一种稳定第一色温，以及向第二光源提供一种第二驱动电流，其中第二光源拥有一种稳定第二色温。此方法还包括改变第一和第二驱动电流以响应调光水平的改变，其中改变第一和第二驱动电流会改变照明装置的色温。
附图说明
通过参考附图可以更好地理解本发明，还可以使熟悉该技术领域者明白本发明的各种目的、特征和优点。在这些附图中使用相同参考号代表相同或相似要素。
图1(标示先前技术)描述了一种具有用于调节白炽灯亮度的常规调光器的照明电路。
图2(标示先前技术)描述了可见光谱的一种光谱功率分布图。
图3(标示先前技术)描述了非白炽灯光源的调光水平和色温之间图形关系。
图4描述了具有多个光源和不同色温的一种照明装置.
图5描述了不同强度下的调光水平和色温分布之间图形关系。
图6描述了一种照明装置的调光水平和色温之间图形关系。
图7描述了具有多种色温的多种LED。
具体实施方式
允许一种包含具有多种色温的光源的照明装置改变色温以响应调光水平变化的一种方法和系统。此光源为非白炽灯光源，例如发光二极管和/或气体放电光源。调光电路提供指示所选调光水平的调光信号。照明装置包括一个光源激励器和一个光源激励器控制器，它们联合改变光源的驱动电流以响应所选的调光水平。通过以不同相对量改变驱动电流，从而，根据调光水平变化改变照明装置的色温。在至少一个实施例中，照明装置响应调光水平改变而产生的色温变化促使白炽灯光源的色温改变。照明装置的组件可置于一个外罩中，照明装置的输入端子可直接与调光器相连，以能够接收通过如2线和4线(具体视调光器配置而定)之间的功率和调光信号。
图4描述了照明系统400，此系统包括一个具有不同色温光源的照明装置402，该照明装置402会响应各种调光水平，改变色温。照明装置402包括一个光源库404，此光源库中的光源具有至少两种色温。在至少一个实施例中，光源库404中各个光源的任何色温及强度变化基本上都不为人的肉眼所察觉。在至少一个实施例中，光源库404中的光源为LED、气体放电光源或LED与气体放电光源的组合。在至少一个实施例中，光源库404包括光源406和光源408。光源406包括至少一个具有稳定色温“A”的光源。光源408包括至少一个具有稳定色温“B”的光源。如果一种光源的色温不随光源强度在全刻度内的改变而显着改变，那么，这种光源的色温便为稳定。例如，当一种光源的驱动电流随各种调光水平而改变时，此光源的色温基本保持不变。光源库404可包括具有相同或不同色温的其它光源。
光源的具体数量和色温的具体组合方式是设计选择上的问题，并取决于光源为响应调光所需的强度水平和色温。总之，增加光源数量可以增加经由光源可实现的强度水平范围。通过增加具有其它色温的光源来改变色温组合或改变具有特定色温的一个光源或多个光源比例，可以确定经由照明装置响应调光可实现的色温范围。
运行过程中，照明装置402与电源相连。在至少一个实施例中，电源140为线电压Vline，例如，是一种交流电(AC)，110-140Vac，60Hz电压。通常，可获得的线电压Vline具有地方化特点。调光电路(调光器)412向相角传感器414提供了一种调光电压VDIM。在至少一个实施例中，调光器412为常规调光器，例如常规调光器102(图1)或基于微控器的调光器。
调光电压VDIM的相角指示调光水平。在至少一个实施例中，使用者用一种控制装置(未显示)选择调光电压相角，例如滑动件、按钮或遥控器，以选择调光水平。在至少一个实施例中，调光电压为周期性交流电压。在至少一个实施例中，为响应调光水平选项，调光器412对线电压Vline斩波以更改调光电压VDIM的相角。调光电压VDIM的相角与所选的调光水平相对应。相角检测器检测调光电压VDIM的相角，并向光源激励器控制器416提供相应的调光水平信号DL。在至少一个实施例中，相角检测器414包括一个使用一种已知频率fosc震荡信号的定时电路；和一个比较器，用于将调光电压VDIM与零线参照比较。调光电压VDIM的频率已知。相角检测器414通过对频率fosc周期计数确定调光电压VDIM的相角，直到比较器检测到调光电压VDIM的斩波点。在另一实施例中，可以使用模拟积分器检测调光电压VDIM的功率，此功率与调光电压VDIM的相角成正比。在另一实施例中，调光电压VDIM的前沿和后沿均可被斩波。名为“一种用于减少噪声且与电子调光器一起使用的灯变压器及其使用方法”、发明人为派屈尼克和巴拉克的6,713,974号美国专利描述了对前沿和后沿调光电压VDIM进行斩波和边沿检测的示范性方法和系统。6,713,974号美国专利在此以引用方式被整体纳入。2007年3月31日递交、发明人为JohnL.Melanson、代理人档案编号为1666-CA-PROV、名为“发光二极管光源镇流器”的美国专利申请描述了示范性光源激励器控制器416。
光源激励器418为白色光源406和黄色光源408提供了一种原始直流(DC)电压VRDC。光源激励器408还向光源406提供了一个或多个驱动电流IA，以及向光源408提供了一个或多个驱动电流IB。光源库404中每个独立控制的光源或光源组被分别供给驱动电流。例如，如果光源406包括两个独立光源，光源激励器418可向各个光源406分别提供驱动电流IA1和IA2，或者光源激励器418向各个光源406提供相同的驱动电流IA。在第一个实施例中，驱动电流IA＝{IA1，IA2}。提供相同驱动电流的方案还应用于向光源408提供一个或多个驱动电流IB，以驱动光源408。光源库404中为独立控制的光源数目是设计选择上的问题，且取决于例如发光装置402所需的颜色范围和强度范围。
光源激励器控制器416将调光水平信号DL转换成控制信号VS，以改变驱动电流IA和IB，从而改变光源100的颜色输出，例如当调光器信号显示增加调光时，颜色将从白色变为暗黄色。控制信号VS使光源激励器418通过改变驱动电流IA和IB而改变光源库404中的光源强度。例如，可通过脉冲宽度调制(PWM)改变驱动电流，以改变一段时间内驱动电流IA和IB的平均值。使用PWM时，控制信号VS将控制各自的开关，而这些开关又控制各自的驱动电流IA和IB供电。可将PWM频率增加到一定值，以避免光源库404的光输出中产生任何人可感知的闪烁。在至少一个实施例中，可改变PWM频率以扩展基础和谐波开关频率的范围，从而使射频干扰降到最低。在至少一个实施例中，PWM频率还可与调光水平DL对应，从而，例如，当调光水平达到100％时，PWM频率可设置为有意使光源库404中的一个或多个光源产生人可感知的闪烁，以模仿如烛光般闪烁。
图5描述了发光装置402在不同强度下调光水平和色温分布之间的一种示范性图形关系500。在调光水平改变时，通过在光源406和光源408上选择与白炽灯色温对应的不同强度组合，光源激励器控制器416能够使发光装置402模仿白炽灯。例如，在0％调光水平(100％强度)时，光源激励器控制器416向光源激励器418提供控制信号VS，使光源激励器418改变驱动电流IA和IB，从而使光源库404中的所有光源在100％强度下运行(即光源的全额定强度)。在此实施例中，光源406的数字比光源408的数字大，因此，在100％强度下光源406的强度比光源408的强度大。在至少一个实施例中，光源406的色温为5000K，光源408的色温为2500K。在另一实施例中，在0％调光水平下，光源激励器控制器416仅使光源406在满强度下运行，光源408为断开。对于0％和100％之间的干预调光水平，光源激励器控制器416向光源激励器418提供控制信号VS，使光源激励器418改变驱动电流IA和IB，以混合光源406和光源408的强度，从而引发色温转变，如图示600所示(图6)。驱动电流IA与IB之间在调光水平方面的关系是设计选择上的问题，可以为任何一种关系，例如非线性、线性、正比或反比。当调光水平达到100％调光水平时，光源激励器控制器416可以向光源激励器418提供控制信号VS，使光源激励器418以非线性形式改变驱动电流IA和IB，从而，显着降低光源406的强度，并且将一个或多个光源408驱动至所需的强度，以模仿完全变暗的白炽灯光的强度和输出颜色。在至少一个实施例中，在100％调光水平下，可断开所有驱动电流。
照明装置402可完全封闭在一个外罩内，例如一个常规外观的灯罩。可配置照明装置的输入端子，使其与常规或其它标准的照明插座完全兼容。可将相角传感器414、光源激励器控制器416、光源控制器418和光源库404作为一个单一的半导体集成电路(IC)、独立半导体IC、或集中到任何半导体IC组合中使用。此外，分立组件可与下列任意一个组件相连：相角传感器414、光源激励器控制器416、光源激励器418和光源库404。调光器412可独立封装，或与下列任意一个元件一起组合包装：相角检测器414、光源激励器控制器416、光源激励器418和光源库404。
图6描述了照明装置400的调光水平与色温之间的一种示范性图形关系600。当调光水平增加时，照明装置400的色温将从5000K降至2500K。图形关系600描述了一种线性增加关系，但在其它实施例中，其能够代表任何所需的函数，例如一种几何级增加或减少的关系。设计精确的颜色转换，以模仿调光水平增加时的白炽灯颜色转换。
图7描述了一个LED库700，此库代表了光源库404的一个实施例。原始直流电压VRDC被应用在串联的LED 702和LED704两端。光源激励器控制器416提供控制信号VS0和VS1，以分别控制开关708和710的闭合(导电)和断开(不导电)。在至少一个实施例中，开关718和710为n-通道场效应晶体管(FET)。在此实施例中，光源激励器控制器416提供开关718和710的栅极电压。驱动电流IA和IB的平均值将控制LED 702和704的强度。二极管712和714仅允许电流单向流动。电感器716和718以及电容器420和422分别调节LED 702和LED 704两端的电压，并进行过滤。电阻器724和726两端的电压被反馈到电源控制器416中，使电源控制器调节开关708和710的开关频率，从而，使驱动电流IA和IB与所选调光水平产生关联。LED库700中的LED数量和排列是设计选择上的问题，例如，取决于LED库700所需的强度和色温范围。
在至少一个实施例中，LED库700包括多个白色LED 702和多个黄色LED 704。白色LED 702和黄色LED 704的比例是设计选择上的问题，例如，取决于照明装置400在调光水平全范围内所需的色谱输出。在至少一个实施例中，白色LED 702和黄色LED 704的比例为10∶1。白色LED 702和黄色704的总数量也是设计选择上的问题，例如，取决于照明系统400所需的强度。LED库700可置于外罩720中。外罩720可为装饰性，例如一种槽型灯罩，它具有多串LED，可以线形、圆形或任何所需的方式排列。
因此，根据来自调光器的调光水平信号改变供给LED库的电流可以使照明装置400利用具有稳定色温的光源来改变色温。
尽管已经对本发明作了详细描述，但应明白，在不偏离所附权利要求中定义的本发明之范围和精神情况下仍可以进行多种变化、替代和更改。

Claims (23)

1.一种照明装置，包括：
两个输入端子，用于接收来自调光器和交流电源的调光信号，其中调光信号的相角指示了调光水平；
一个具有稳定第一色温的第一光源；
一个具有稳定第二色温的第二光源；
一个光源激励器，其与第一光源和第二光源相连；并与输入端子相连，以向第一光源提供第一驱动电流以及向第二光源提供第二驱动电流；以及
一个光源激励器控制器，其与光源激励器相连，以使光源激励器响应于调光信号的相角指示的调光水平的改变而改变第一和第二驱动电流，其中改变第一和第二驱动电流改变照明装置的色温；
其中照明装置被配置成：
在调光水平从100％降低到0％的同时，单调地增加第一光源的强度；以及
在调光水平从100％降低到0％的同时，单调地增加第二光源的强度。
2.根据权利要求1所述的照明装置，还包括：
一个相角检测器，用来检测调光信号的相角，以确定调光水平，以及
照明装置被进一步配置成：
在调光水平在从100％到某个值的范围中时，将第一光源的亮度设置为低于第二光源的亮度；以及
在调光水平在从所述某个值到0％的范围中时，将第一光源的强度设置为高于第二光源的强度。
3.根据权利要求1所述的照明装置，还包括：
一个围封第一光源、第二光源、光源激励器和光源激励器控制器的外罩，其中N个输入端子穿过外罩。
4.根据权利要求1所述的照明装置，其中照明装置被放置在一个槽型灯具中。
5.根据权利要求1所述的照明装置，还包括：
其中第一光源包含多个白色LED，第二光源包含多个黄色LED。
6.根据权利要求1所述的照明装置，其中第一光源包含至少一个具有第一色温的灯，第二光源包含至少一个具有第二色温的灯。
7.根据权利要求6所述的照明装置，其中灯为气体放电灯。
8.根据权利要求6所述的照明装置，其中灯为发光二极管。
9.根据权利要求6所述的照明装置，其中第一光源包含多个具有第一色温的灯，第二光源包含多个具有第二色温的灯。
10.根据权利要求1所述的照明装置，其中改变第一和第二驱动电流(i)在0％至90％之间的调光水平的连续的第一范围上改变照明装置的色温，以及(ii)在调光水平的第二范围上改变照明装置的强度，其中该调光水平的第二范围包括0％至100％之间的调光水平的连续范围，并且其中0％至100％之间的该调光水平的第二范围包括0％至90％之间的该调光水平的第一范围。
11.一种改变照明装置色温的方法，该方法包括：
利用N个输入端子中的至少一个接收调光信号，其中调光信号的相角指示了一段时间内的调光水平，N为小于或等于4的正整数；
利用N个输入端子中的至少两个接收来自电源的功率；
向第一光源提供第一驱动电流，其中第一光源具有稳定第一色温；
向第二光源提供第二驱动电流，其中第二光源具有稳定第二色温；其中
在调光水平从100％降低到0％的同时，单调地增加第一光源的强度；以及
在调光水平从100％降低到0％的同时，单调地增加第二光源的强度。
12.根据权利要求11所述的方法，还包括：
检测调光信号的相角以确定调光水平；以及
在调光水平在从100％到某个值的范围中时，将第一光源的亮度设置为低于第二光源的亮度；以及
在调光水平在从所述某个值到0％的范围中时，将第一光源的强度设置为高于第二光源的强度。
13.根据权利要求11所述的方法，其中照明装置置于一个单外罩内。
14.根据权利要求11所述的方法，其中照明装置被放置与一个槽型灯具中。
15.根据权利要求11所述的方法，其中第一光源包含多个白色LED，第二光源包含多个黄色LED。
16.根据权利要求11所述的方法，其中第一光源包含至少一个具有第一色温的灯，第二光源包含至少一个具有第二色温的灯。
17.根据权利要求16所述的方法，其中灯为气体放电灯。
18.根据权利要求16所述的方法，其中灯为发光二极管。
19.根据权利要求16所述的方法，其中第一光源包含多个具有第一色温的灯，第二光源包含多个具有第二色温的灯。
20.根据权利要求11所述的方法，其中第一和第二驱动电流为响应调光水平而发生的改变是指第一驱动电流与第二驱动电流成反比的改变。
21.根据权利要求11所述的方法，其中改变第一和第二驱动电流(i)在0％至90％之间的调光水平的连续的第一范围上改变照明装置的色温，以及(ii)在调光水平的第二范围上改变照明装置的强度，其中该调光水平的第二范围包括0％至100％之间的调光水平的连续范围，并且其中0％至100％之间的该调光水平的第二范围包括0％至90％之间的该调光水平的第一范围。
22.根据权利要求1所述的照明装置，其中响应于调光水平的改变而改变第一和第二驱动电流以改变照明装置的色温和强度，从而模拟白炽灯光源的色温改变。
23.根据权利要求11所述的方法，其中响应于调光水平的改变而改变第一和第二驱动电流，其中改变第一和第二驱动电流以改变照明装置的色温和强度包括：
响应于调光水平的改变而改变第一和第二驱动电流，其中响应于调光水平的改变而改变第一和第二驱动电流以改变照明装置的色温和强度，从而模拟白炽灯光源的色温改变。
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