@JoJoBond T'is a hard one. Ya know, you could just categorize different lasers into different categories... But if that's not what you're after, I'd say that the other factor would probably be something like the area of the laser, but I don't know how that would work...
I call it a compound laser. It stacks lots photons on top of each other, therefore acting like several lasers. In this case, 20. I also put clone, which lets photons through, in the middle to radiate the heat as the photons pass. Notice the long barrel as well, it's to give the photons space to take in heat. I used blue photons as the red were too destructive that the excess blocked the ray. And I used seed as my heating GoL of choice because no part of it was stationary, meaning maximum heat.