China 'GB/T 21111-2007
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 21111-2007
Projection in indoor rooms - Classification of transmitting projection screens and measurement of their transmitted luminance levels 室内放映 透射放映银幕的分类和亮度测定
Issued Date:2007-10-11
Implemented Date:2007-12-01
Issued by:
The Standardization Administration of the People's Republic of China