well , they are tied together somewhat
You are trying to save weight, there are other options
Many like the fenix LD01, just clip on hat bill
Some like photons with hat clip, or velcro dot to velcro to cap bill
some will take light elastic and make a UL headstrap for another headlamp
some just clip zebralights to belt or pack strap
it all depends on what you use it for, and how much you need
Unless night hiking, a headlamp is overkill for me. A little photon is all I need.