How to check quality of LED light panel

http://www.cutcnccam.com/article-show-2012825918383.shtml

LED light panels are different in many ways.
A high grade LED light panel generally comes from a high performance optic acrylic sheets (most used in LCD displays) instead of decorative acrylic sheets. Some LED light panel with "V-cut" grids on the back while others imprinted grids on sheets.
To check a LED light panel, we also need check whether its brightness and power-efficency meet the standards.
CUTCNC offer cnc machine to make V-cut matrix pattern for custom LED light panel and especially for large format LED light panel.
We offer LED light panel sample made by our machine to check its quality upon customer's request for free.
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