P7 versus XML

How come a XML blows a p7 out the door ? I have a spear clone p7, I thought it was bright on 1/18650 then I get the uf2100 smaller lens build and all and it lights up my backyard a lot more than the p7 ,I know I’ve been away a while but this is freaking crazy, also couldni simply swap the p7 out with a XML on the spear clone? I’m not sure if the head is removable but the reflector is way deeper than the uf 2100 so I’m thinking it would be doubly bright ,lol
My beamtech4000 from tart is in ny so should have it in a day or two I’m like a baby at a candy store lol

Well, it's like T800 vs. T1000. The newer model is more efficient, the product of better engineering. Hence, much brighter.