How calculate LUX on Studio command 1200

Hi all!
I have a problem. I need to illuminate a boxing match, there is a 24 Studio commands 1200 (15000 lumens) hanging at a height of 10 m, boxing ring is 8x8m. The TV requirements of illuminance is 1500 lux. If we assume that the formula lx = lm / m², luminance of 24 Studio commands get very low. I do not believe that the commands so weak. Where am I wrong?
Thank you!
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