The NU20 and NU20 CRI are pretty compact, and certainly have an excellent size/output ratio.
The AAA Fenix HL10 is also pretty compact, but only 70 lumens (which is good enough for urban night running).
The NU20 and NU20 CRI are pretty compact, and certainly have an excellent size/output ratio.
The AAA Fenix HL10 is also pretty compact, but only 70 lumens (which is good enough for urban night running).