先答一个：
NVLAP的V应该是Voluntary，中文是 国家实验室自愿认可程序。在网上也能找到相关的信息

第二个：LER是Luminaire efficiency rating，照明效率等级。顺便说一下，NEMA是 National Electrical Manufacturers Association。关于LER的定义如下：
LER: Luminaire efficiency rating,which is calculated according to NEMA LE 5. This value can beestimated from photometric data using the following formula:
1. LER is equal to the product of total ratedlamp lumens times BF timesluminaire efficiency, divided by input watts.