一品楼qm楼凤论坛_一品阁qm论坛_上海后花园spa水磨_石家庄品茶QQ方式

Product Description:

Used to measure for LED of luminous flux,illumination, in strict accordance with national standard design,V(λ)correction,up to national standard accuracy test data can be directly traced back to China Institute of Metrology NIM,NIST United States.