Different versions of Grimlight that has been produced.
The version produced for the Kickstarter campaign. 21 mm in diameter and 2.3 mm high at the thickest point. Running time with LEDs on, about 14h.
The populated PCB for the first batch of prototypes assembled by the manufacturer.
The circuit consists of a microcontroller for individually controlling two LEDs and a battery holder for a 12 mm coin cell battery.
From oldest to latest.