推荐回答（5个）
6500K是指灯管的色温。
理想黑体受热发光，用它受热温度表示它发光颜色，叫“色温”；其中温度用开氏（开尔文）温度，又称绝对温度。我们常用的摄氏温度(约)加273。
色温，可以比较方便、直观的表示白光的光色。色温低，白里带黄，称暖色调；色温高，白里带蓝，称冷色调。
绿光，不能用色温表示；蓝光，更本无色温。
强调一下，色温决不能表示光源光谱质量(不同民族有不同喜好)，只能表示光源的光色。
我国，通常把显示屏的白场调到6500K；欧美国家通常调到5000K(没有5600K这档)或4000K；东亚人及非洲人通常调到9300K或更高。
对节能灯，我们国家规定了如下的要求，x、y偏离值小于5SDCM。
编号 名称 符号 x y
F6500 日光色 RR .313 .337
F5000 中性白色 RZ .346 .359
F4000 冷白色 RL .380 .380
F3500 白色 RB .409 .394
F3000 暖白色 RN .440 .403
F2700 白炽灯色 RD .463 .420
节能灯上的6500K是表示色温。
色温（colo(u)r temperature）是表示光源光色的尺度，单位为K（开尔文）。色温是表示光源光谱质量最通用的指标。一般用Tc表示。一些常用光源的色温为：标准烛光为1930K；钨丝灯为2760-2900K；荧光灯为3000K；闪光灯为3800K；中午阳光为5600K；电子闪光灯为6000K；蓝天为12000-18000K。
也就是说你这支节能灯的是6500K，就是常说的冷白光，跟阳光下的光色差不多，另一种常用的色温是2700K，就跟白炽灯（钨丝灯泡）光色差不多。
色温。是黑体即碳加热到6500K氏温度时所发出的光的颜色。
6500K是指灯管的色温.
理想黑体受热发光，用它受热温度表示它发光颜色，叫“色温”。
色温，可以比较方便、直观的表示白光的光色。
色温低，白里带黄，称暖色调；色温高，白里带蓝，称冷色调。
强调一下，色温只能表示光源的光色。一般我们灯管最常见的色温有四种:
3000K 肉眼看的黄光
4100K 不白不黄,但光线比较柔和(相对6500K来说)
6000K 常见的日光灯白光
6500K 节能T5型日光灯白光（有点微蓝）
一般色温越高，亮度越高，照度相对来说有点偏低。
这个是色温的意思，就是说你的灯泡发出的光是什么颜色的！
色温K：白光6500K，黄光2700K
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