Brightness measurement

Can any of the clever people on this group help me out?

I'm trying to compare two A3 LED Light Boxes and work out which is the  
brightest.

The first states - "Lumen: 1800 ~ 2100 mcd"

The second - "Brightness: 730cd/m², Luminous Flux: 372LM"

Obviously they are not necessarily comparing like with like, and are  
probably incomplete specs, so it is confusing.

Is there an easy way to tell from those specs?

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