Low Power in LightBurn.. using outur master 2

hello, i just got my first outur laser. so i discovered that for some reason i dont get full power in the lightburn software… when i use laser GRBL it burns very dark images quickly and at a good speed. when i try to use the same image in light burn same settings and power at 100% it barly leaves a mark on cardboard…is there a setting im missing? am i supposed to be getting this power loss?