白光照明LED灯温度特性的研究

分析了荧光粉转换型白光LED照明光源色坐标、显色指数、色温和发光效率与驱动电流和温度的关系。驱动电流的增加将引起蓝光波峰的长移，并随电流的增大而增大；但其对色坐标、色温和显色指并未引起较大的变化，而发光效率发生下降，主要原因为蓝光波峰的红移导致荧光粉与激发波长的不匹配，引起荧光粉发光效率的下降，这个现象在不同环境温度下的发光也得到证实，实验结果认为LED的驱动电流为20mA，温度低于50℃时具有较好的发光效率，而显色指数要通过增加红色成分来改善。     

An objective method for color vision deficiencies measurement based on visual evoked potential

Normal color perception depends on the absorption of photons by the three classes of cone photoreceptor in the retina. As the peak sensitivities of the three cones, it is convenient to refer to the three types of cone as S-cone, M-cone, and L-cone respectively[1]. But any malfunction of the cones can lead to abnormal color appreciations. They are called color vision deficiencies. Many forms of them are congenital in origin, although it can be acquired as a result of eye disease, or as a side…