They all have 120° beam angle supposedly, i dont know that for certain yet. I just laid out a 5 meter roll of the thicker waterproof stuff and it uses up 3.5" x 24", so 0.7 sq ft and i think this one is 36w, so i could squeeze a bit over 50 watts per sq ft out of this stuff. That would be toward the lower end in terms of wattage. The run anywhere from 15w to 144w per 5m roll, so much higher wattage per square foot can be achieved. Really though, you'd probably do better measuring output in lumens instead of wattage, watts are really only useful for determining LM/w efficiency these days.
