色温CCT与色坐标xy互换

在照明系统设计中，要想做到色温可调，色温、色品图转换是越不过的坎。

然而网上的一些工具以及计算公式各不相同，应用范围有限。本人通过查找相关论文，以及实际应用测试，总结了相关公式。 

• 附件中支持色坐标到色温的转换，涉及到两套公式，第一套公式的精度较高，误差在3K左右。
• 也支持色温到色坐标的转换，绿表格中输入对应的值，黄色表格就会出相应的值。

	xm	0.3000	ym	0.4061	CCT	4000
公式一计算CCT值		6651			Ym	600.0
公式二计算CCT值		6587		CCT换算x坐标		0.3805
				CCT换算y坐标		0.3767

• 采用相关公式算出的坐标曲线与色品图中的色温曲线完全重合，支持1666k~25000k。

• 已知冷暖灯珠的xyY（色坐标值），采用pwm调光，就可以算出对应的PWM占空比大小。

	x	y	Y	CCT	占空比
冷灯珠参数	0.3196	0.3375	500	6500	0.633
暖灯珠参数	0.4638	0.4141	500	2700	0.462

• 以及色温对应RGB值表（下表截取一部分），也会显示对应色温的颜色，清晰明了。色温步进为10k，非常精细。步进可自行添加。

2380	0.4876	0.4148	54.18314717	46.1	255	159	64
2390	0.4866	0.4148	54.32117772	46.3	255	159	65
2400	0.4857	0.4147	54.4594467	46.5	255	160	66
2410	0.4847	0.4146	54.59795505	46.7	255	160	66
2420	0.4838	0.4145	54.73670361	46.9	255	161	67
2430	0.4829	0.4144	54.87569314	47.1	255	161	68
2440	0.4819	0.4144	55.01492426	47.3	255	162	69
2450	0.4810	0.4143	55.15439752	47.5	255	162	70
2460	0.4801	0.4142	55.29411337	47.7	255	163	71
2470	0.4792	0.4141	55.43407218	47.9	255	163	71
2480	0.4783	0.4139	55.57427423	48.1	255	164	72
2490	0.4774	0.4138	55.71471973	48.3	255	164	73
2500	0.4765	0.4137	55.85540882	48.5	255	165	74
2510	0.4756	0.4136	55.99634155	48.7	255	165	75
2520	0.4747	0.4135	56.13751792	48.9	255	165	75
2530	0.4738	0.4133	56.27893787	49.1	255	166	76
2540	0.4729	0.4132	56.42060126	49.3	255	166	77
2550	0.4720	0.4131	56.56250792	49.5	255	167	78
2560	0.4711	0.4129	56.70465761	49.7	255	167	79
2570	0.4703	0.4128	56.84705003	49.9	255	168	79
2580	0.4694	0.4127	56.98968484	50.1	255	168	80
2590	0.4685	0.4125	57.13256168	50.3	255	168	81
2600	0.4677	0.4123	57.27568009	50.5	255	169	82
2610	0.4668	0.4122	57.41903963	50.7	255	169	82
2620	0.4660	0.4120	57.56263978	50.9	255	170	83
2630	0.4651	0.4119	57.70647999	51.1	255	170	84
2640	0.4643	0.4117	57.85055969	51.3	255	170	85
2650	0.4634	0.4115	57.99487826	51.5	255	171	85
2660	0.4626	0.4114	58.13943508	51.7	255	171	86
2670	0.4618	0.4112	58.28422945	51.9	255	172	87
2680	0.4610	0.4110	58.31711239	52.0	255	172	88
2690	0.4601	0.4108	58.35053368	52.1	255	173	88
2700	0.4593	0.4107	58.38448778	52.2	255	173	89
2710	0.4585	0.4105	58.41896919	52.3	255	173	90
2720	0.4577	0.4103	58.45397248	52.4	255	174	91
2730	0.4569	0.4101	58.48949226	52.5	255	174	91
2740	0.4561	0.4099	58.52552322	52.6	255	174	92
2750	0.4553	0.4097	58.56206008	52.7	255	175	93
2760	0.4545	0.4095	58.59909763	52.8	255	175	93
2770	0.4537	0.4093	58.63663072	52.9	255	176	94
2780	0.4529	0.4091	58.67465425	53.0	255	176	95
2790	0.4521	0.4089	58.71316316	53.1	255	176	95
2800	0.4514	0.4087	58.75215249	53.2	255	177	96
2810	0.4506	0.4085	58.79161728	53.3	255	177	97
2820	0.4498	0.4083	58.83155266	53.4	255	177	97
2830	0.4490	0.4081	58.87195381	53.5	255	178	98
2840	0.4483	0.4079	58.91281595	53.6	255	178	99
2850	0.4475	0.4076	58.95413438	53.7	255	179	100
2860	0.4468	0.4074	58.99590443	53.8	255	179	100
2870	0.4460	0.4072	59.14765419	54.0	255	179	101
2880	0.4453	0.4070	59.29959872	54.2	255	180	102
2890	0.4445	0.4068	59.45173733	54.4	255	180	102
2900	0.4438	0.4065	59.60406931	54.6	255	180	103
2910	0.4430	0.4063	59.75659394	54.8	255	181	104
2920	0.4423	0.4061	59.90931049	55.0	255	181	104
2930	0.4416	0.4058	60.06221825	55.2	255	181	105
2940	0.4409	0.4056	60.21531645	55.4	255	182	106
2950	0.4401	0.4054	60.36860438	55.6	255	182	106
2960	0.4394	0.4051	60.52208126	55.8	255	183	107
2970	0.4387	0.4049	60.67574636	56.0	255	183	108
2980	0.4380	0.4047	60.8295989	56.2	255	183	108
2990	0.4373	0.4044	60.98363814	56.4	255	184	109
3000	0.4366	0.4042	61.1378633	56.6	255	184	109
3010	0.4359	0.4039	61.29227361	56.8	255	184	110
3020	0.4352	0.4037	61.44686831	57.0	255	185	111
3030	0.4345	0.4034	61.60164661	57.2	255	185	111
3040	0.4338	0.4032	61.75660775	57.4	255	185	112
3050	0.4331	0.4029	61.91175094	57.6	255	186	113
3060	0.4324	0.4027	62.0670754	57.8	255	186	113
3070	0.4317	0.4024	62.22258036	58.0	255	186	114
3080	0.4311	0.4022	62.37826503	58.2	255	187	115
3090	0.4304	0.4019	62.53412863	58.4	255	187	115
3100	0.4297	0.4017	62.69017038	58.6	255	187	116
3110	0.4290	0.4014	62.8463895	58.8	255	188	116
3120	0.4284	0.4012	63.00278519	59.0	255	188	117
3130	0.4277	0.4009	63.15935669	59.2	255	188	118
3140	0.4271	0.4007	63.31610321	59.4	255	188	118
3150	0.4264	0.4004	63.3665256	59.5	255	189	119
3160	0.4258	0.4001	63.41730842	59.6	255	189	120
3170	0.4251	0.3999	63.46844816	59.7	255	189	120
3180	0.4245	0.3996	63.51994133	59.8	255	190	121
3190	0.4238	0.3993	63.57178453	59.9	255	190	121
3200	0.4232	0.3991	63.62397435	60.0	255	190	122
3210	0.4225	0.3988	63.67650747	60.1	255	191	123
3220	0.4219	0.3985	63.72938057	60.2	255	191	123
3230	0.4213	0.3983	63.7825904	60.3	255	191	124
3240	0.4207	0.3980	63.83613373	60.4	255	192	124
3250	0.4200	0.3977	63.89000738	60.5	255	192	125
3260	0.4194	0.3975	63.94420821	60.6	255	192	125
3270	0.4188	0.3972	63.99873309	60.7	255	192	126
3280	0.4182	0.3969	64.05357898	60.8	255	193	127
3290	0.4176	0.3967	64.10874283	60.9	255	193	127
3300	0.4170	0.3964	64.16422165	61.0	255	193	128
3310	0.4163	0.3961	64.22001248	61.1	255	194	128
3320	0.4157	0.3958	64.2761124	61.2	255	194	129
3330	0.4151	0.3956	64.33251852	61.3	255	194	130
3340	0.4145	0.3953	64.38922798	61.4	255	194	130
3350	0.4139	0.3950	64.44623797	61.5	255	195	131
3360	0.4134	0.3947	64.5035457	61.6	255	195	131
3370	0.4128	0.3945	64.56114842	61.7	255	195	132
3380	0.4122	0.3942	64.61904342	61.8	255	196	132
3390	0.4116	0.3939	64.67722799	61.9	255	196	133
3400	0.4110	0.3936	64.7356995	62.0	255	196	134
3410	0.4104	0.3934	64.79445532	62.1	255	196	134
3420	0.4099	0.3931	64.85349286	62.2	255	197	135
3430	0.4093	0.3928	64.91280955	62.3	255	197	135
3440	0.4087	0.3925	64.97240288	62.4	255	197	136
3450	0.4081	0.3923	65.13632196	62.6	255	198	136
3460	0.4076	0.3920	65.30037241	62.8	255	198	137
3470	0.4070	0.3917	65.46455373	63.0	255	198	138
3480	0.4065	0.3914	65.62886546	63.2	255	198	138
3490	0.4059	0.3911	65.79330711	63.4	255	199	139
3500	0.4053	0.3909	65.95787821	63.6	255	199	139
3510	0.4048	0.3906	66.12257827	63.8	255	199	140
3520	0.4042	0.3903	66.28740682	64.0	255	199	140
3530	0.4037	0.3900	66.45236339	64.2	255	200	141
3540	0.4031	0.3897	66.61744751	64.4	255	200	141
3550	0.4026	0.3894	66.78265869	64.6	255	200	142
3560	0.4021	0.3892	66.94799647	64.8	255	201	142
3570	0.4015	0.3889	67.11346039	65.0	255	201	143
3580	0.4010	0.3886	67.27904997	65.2	255	201	144
3590	0.4005	0.3883	67.44476476	65.4	255	201	144
3600	0.3999	0.3880	67.61060427	65.6	255	202	145
3610	0.3994	0.3878	67.77656806	65.8	255	202	145
3620	0.3989	0.3875	67.94265566	66.0	255	202	146
3630	0.3984	0.3872	68.10886661	66.2	255	202	146
3640	0.3978	0.3869	68.27520045	66.4	255	203	147
3650	0.3973	0.3866	68.44165673	66.6	255	203	147
3660	0.3968	0.3863	68.608235	66.8	255	203	148
3670	0.3963	0.3861	68.7749348	67.0	255	203	148
3680	0.3958	0.3858	68.94175567	67.2	255	204	149
3690	0.3953	0.3855	69.00616202	67.3	255	204	149
3700	0.3948	0.3852	69.07080101	67.4	255	204	150
3710	0.3942	0.3849	69.13567066	67.5	255	204	151
3720	0.3937	0.3846	69.20076903	67.6	255	205	151
3730	0.3932	0.3844	69.2660942	67.7	255	205	152
3740	0.3927	0.3841	69.33164425	67.8	255	205	152
3750	0.3923	0.3838	69.3974173	67.9	255	205	153
3760	0.3918	0.3835	69.46341151	68.0	255	206	153
3770	0.3913	0.3832	69.52962501	68.1	255	206	154
3780	0.3908	0.3829	69.59605601	68.2	255	206	154
3790	0.3903	0.3827	69.66270269	68.3	255	206	155
3800	0.3898	0.3824	69.72956327	68.4	255	207	155
3810	0.3893	0.3821	69.79663601	68.5	255	207	156
3820	0.3888	0.3818	69.86391915	68.6	255	207	156
3830	0.3884	0.3815	69.93141098	68.7	255	207	157
3840	0.3879	0.3812	69.9991098	68.8	255	208	157
3850	0.3874	0.3810	70.06701393	68.9	255	208	158
3860	0.3869	0.3807	70.1351217	69.0	255	208	158
3870	0.3865	0.3804	70.20343146	69.1	255	208	159
3880	0.3860	0.3801	70.27194159	69.2	255	208	159
3890	0.3855	0.3798	70.34065048	69.3	255	209	160
3900	0.3851	0.3795	70.40955654	69.4	255	209	160
3910	0.3846	0.3793	70.4786582	69.5	255	209	161
3920	0.3841	0.3790	70.54795389	69.6	255	209	161
3930	0.3837	0.3787	70.61744207	69.7	255	210	162
3940	0.3832	0.3784	70.68712123	69.8	255	210	162
3950	0.3828	0.3781	70.75698985	69.9	255	210	163
3960	0.3823	0.3779	70.82704645	70.0	255	210	163
3970	0.3819	0.3776	70.89728955	70.1	255	211	164
3980	0.3814	0.3773	70.96771767	70.2	255	211	164
3990	0.3810	0.3770	71.13937966	70.4	255	211	165
4000	0.3805	0.3767	71.30647385	70.6	255	211	165
4010	0.3800	0.3764	71.47843975	70.8	255	211	166
4020	0.3796	0.3761	71.64957602	71.0	255	212	166
4030	0.3791	0.3759	71.82081284	71.2	255	212	167
4040	0.3787	0.3756	71.99215034	71.4	255	212	167
4050	0.3783	0.3753	72.16358861	71.6	255	212	168
4060	0.3778	0.3750	72.33512777	71.8	255	213	168
4070	0.3774	0.3748	72.5067679	72.0	255	213	169
4080	0.3770	0.3745	72.67850909	72.2	255	213	169
4090	0.3766	0.3742	72.8503514	72.4	255	213	170
4100	0.3761	0.3740	73.0222949	72.6	255	213	170
4110	0.3757	0.3737	73.19433964	72.8	255	214	170
4120	0.3753	0.3734	73.36648566	73.0	255	214	171
4130	0.3749	0.3731	73.538733	73.2	255	214	171
4140	0.3745	0.3729	73.61065785	73.3	255	214	172
4150	0.3740	0.3726	73.68276123	73.4	255	215	172
4160	0.3736	0.3723	73.75504211	73.5	255	215	173
4170	0.3732	0.3721	73.92780854	73.7	255	215	173
4180	0.3728	0.3718	74.00040377	73.8	255	215	174
4190	0.3724	0.3715	74.07317374	73.9	255	215	174
4200	0.3720	0.3713	74.14611746	74.0	255	216	175
4210	0.3716	0.3710	74.21923388	74.1	255	216	175
4220	0.3712	0.3707	74.29252202	74.2	255	216	176
4230	0.3708	0.3705	74.36598084	74.3	255	216	176
4240	0.3704	0.3702	74.43960935	74.4	255	216	177
4250	0.3700	0.3699	74.51340654	74.5	255	217	177
4260	0.3696	0.3697	74.58737142	74.6	255	217	177
4270	0.3692	0.3694	74.66150298	74.7	255	217	178
4280	0.3688	0.3692	74.73580025	74.8	255	217	178
4290	0.3684	0.3689	74.81026222	74.9	255	217	179
4300	0.3681	0.3686	74.88488793	75.0	255	218	179
4310	0.3677	0.3684	74.95967638	75.1	255	218	180
4320	0.3673	0.3681	75.03462661	75.2	255	218	180
4330	0.3669	0.3678	75.10973764	75.3	255	218	181
4340	0.3665	0.3676	75.18500851	75.4	255	218	181
4350	0.3662	0.3673	75.26043826	75.5	255	219	181
4360	0.3658	0.3671	75.33602593	75.6	255	219	182
4370	0.3654	0.3668	75.41177057	75.7	255	219	182
4380	0.3650	0.3666	75.48767123	75.8	255	219	183
4390	0.3647	0.3663	75.56372696	75.9	255	219	183
4400	0.3643	0.3660	75.63993683	76.0	255	220	184
4410	0.3639	0.3658	75.7162999	76.1	255	220	184
4420	0.3636	0.3655	75.79281524	76.2	255	220	184

资料整理不易，多谢支持。

色温CCT与色坐标xy互换计算表格-嵌入式文档类资源-CSDN下载附件中表格支持色坐标到色温的转换，涉及到两套公式，第一套公式的精度较高，误差在3K左右。也支持色温更多下载资源、学习资料请访问CSDN下载频道.https://download.csdn.net/download/xiaoredred/85819710