So this kinda helps a little with it so I kinda understand a bit more Right here we are 3 bulbs producing 1000L each make a total of 1500L spread 3 bulbs producing 1000L each make a total of 3000L focused Which basically mean if they run parallel and the light is scattered over a surface it will only product half the lumens of the total of all bulbs used unless all bulbs are focused onto a single spot then the linens will total the number of all bulbs cumulative Does that make sense