Lumens per square foot is not a legitimate measurement of resultant light on a target, so it's not a metric that useful in the lighting industry. Also, total lumens is not an indication of anything, really, so it's also not a metric that's used in the lighting industry.
I only point this out, not to dismiss the effort to be helpful, but only to make sure that others aren't led down the wrong path. Lots of effort has been put forth in this forum to educate the members about lighting and how to do it well, and also to dispel information that's not accurate. Too often, folks go to sites like YouTube, only to be misinformed and misled by folks that dont know the first thing that they're talking about. "I put a MILLION LUMENS in my Garage!!!" is the thumbnail clickbait. It's silly and it means nothing. They're just pandering to the uneducated for clicks.
CD