Left OEM, right with correct TIR optic. Better color mixing too. No more overly rosy hot spot. 700 hidden lumens unleashed!
The OEM TIR only uses ~ 60 degree of the beam. The rest just dumped and absorbed by the head. The Prime is running cooler now. The picture shows the OEM optic paired with 144AM
Left OEM, right Yiajiamei 5 degree XP TIR optic
Reduced temperature can’t be seen in this test since it’s watercooled.
Find the optic HERE
NOTE: I have no affiliation to Shenzhen Yiajiamei, or paid by them. I just like the products so much!
Enjoy! 
- Clemence