Well my son doesn't want to go biking at night so the SF-90 bike light is of no use to him. Therefore I decided to install it back to my MTB. The SF-90, being the farther thrower is now my hi-beam allowing me to see objects as far as 200 meters away in the road. The X-2, having two XM-L emitters is now my low-beam allowing me to see obstacles in the path.

Here's another pic taken on my two bike lights from the opposite angle .