Circuitry is ziptied to the brake cable housing. No supercaps for standlights. Big thick cable for low-off-high.
Trekking bike. Circuitry and supercap is inside the steerer tube. The big thick cable is the remote for low-off-high.
Both lights have taillight wired in as well (with supercaps for the taillight as well).
1" tall by 2" wide. Heat sinked because it's 6 leds in a very small form factor.
Generator-Powered LED DIY- Mtbr.com