课题组进一步研究了不同粉体的灯珠在大电流密度下的光效衰减情况，即在电流密度100 A/cm²下长时间点亮3 min，测试其灯珠光效变化，测试结果如图34所示，LSN:Ce灯珠较稳定，衰减幅度约为20%，YAG:Ce灯珠光效急剧降低，衰减幅度达到了80%左右。

The research group further studied the light effect attenuation of light beads with different powders under high current density, that is, light up for 3 min under the current density of 100 a / cm2 for a long time, and test the light effect change of light beads. The test results are shown in Fig. 34. LSN: Ce light beads are relatively stable, with an attenuation range of about 20%, and YAG: CE light beads have a sharp decrease in light effect, with an attenuation range of about 80%.