The National Highway Transportation Safety Administration (NHTSA) issued modifications to the Federal Motor Vehicle Safety Standard 108 (FMVSS 108) effective on December 1, 2012. Although these changes are not new, many manufacturers are still working to decipher what the changes mean for their products. 

美国国家公路交通安全管理局（NHTSA）颁布于2012年12月1日，修改联邦机动车辆安全标准108（FMVSS 108）有效尽管这些变化并不新鲜，很多厂商仍在努力破译什么变化意味着他们产品。

Two points in particular remain subject to interpretation in the FMVSS 108 standard. The first relates to LED testing for signal and marking lights such as LED tail lamps or LED lamps on the outside of a vehicle's rear-view mirror. The second is specific to photometric degradation and the calculation of Effective Projected Luminous Lens Area (EPLLA). Intertek's experts have collated information to address these two areas of ambiguity and help manufacturers better understand the issues in order to make decisions on how best to handle testing requirements.

尤其有两点仍受解释在FMVSS 108标准。第一个问题涉及信号和标志灯LED测试如LED尾灯或车辆的后视镜的外侧LED灯。二是具体到光度退化和有效的计算投影发光透镜区域（EPLLA）。 Intertek的专家已经整理信息，以解决模糊这两个领域，并帮助厂商更好地了解，以就如何最好地处理测试要求决定的问题。

From a technological standpoint, LEDs are brightest when initially turned on, and then achieve thermo equilibrium over a period of time. The Society of Automotive Engineers (SAE) Recommended Practice J1889 discusses this characteristic and recommends that in testing situations, a photometric reading for these products be taken at the end of one minute, and then again after 30 minutes, to see how much the LED has degraded. 

从技术角度来看，LED是亮时最初被打开，然后实现在一段时间的热平衡。汽车工程师的推荐做法J1889协会（SAE）讨论了这一特点，并建议在测试情况，测光读数为这些产品在一分钟结束时服用，然后在30分钟后再次看到LED拥有多少降级。

However, in an effort to avoid "undue hardships" on manufacturers, J1889 has not been officially incorporated into FMVSS 108. This has led to confusion over the exact regulations and subsequent testing requirements. SAE recommends that J1889 guidelines be complied with as a part of FMVSS 108, and certain states and countries (including California, Canada, and UNECE countries) already require manufacturers to comply. But J1889 is not a federal mandate because it is not part of FMVSS 108. Therefore, it is left to manufacturers to decide whether they want to self-test to J1889 or have a third party laboratory perform the testing for them.

然而，在努力避免对制造商“不适当艰辛”，J1889尚未正式纳入FMVSS 108这导致混乱的确切规定和随后的测试要求。 SAE建议J1889准则，为FMVSS 108，和某些州和国家（包括美国加州，加拿大和欧洲经委会国家）已要求制造商遵守的一部分得到遵守。但是J1889不是联邦法令，因为它不是FMVSS 108的一部分。因此，这是留给制造商来决定他们是否要自检，J1889或有第三方实验室进行测试他们。（航韵认证）