While I agree that crop choices matter too, all LED lights have penetration issues. It's not that plants will not grow past XYZ feet tall under LED, they just don't grow as well past XYZ feet. As beefxer's test shows; the the flowers at the top are much better than those a little farther down. While your pepper plants might be 5 feet tall; that doesn't mean that they get as much light lower down as they do at the top.
CLW does use 120 degree diodes and that does help them cover more area but if they used 90 degree lenses they would cover less area so everything is a trade off. To compensate they use 5w diodes. Lumigrow doesn't even say on their website if they use 3w or what degree lenses the diodes use so it's hard to guess. A 1000w HPS has better coverage and better penetration but I still wouldn't try to grow 10 foot tall corn with that light either. As you said; what you're growing matters, especially inside with artificial lighting.