Abstract: A primary element of a flashlight is provided, incorporating the light source, driver circuitry, positive and negative battery contacts and heat sinking into a single element assembled through standard manufacturing methods on a double-sided metal core printed circuit board substrate. Heat generated by the light source and driver circuit is conducted away through the substrate and may be sunk into a flashlight housing or other mounting structure at the edge of the flashlight element or from top, bottom or both surfaces near the edge. Additional sensors and control functions may be incorporated into the driver circuit to vary the light source drive in response to changes in temperature or light source optical output.

Abstract: A single-wire serial data communications bus is established between an electronic accessory, such as an optical laser sight, and a host controller, using an externally accessible connector on the electronic accessory generally having another primary purpose, such as connection of a remote switch. The need for more complex connection schemes for calibration and control of the electronic accessory is thus eliminated. Furthermore, the single-wire bus enables a range of other host devices, such as a smart switch or an ambient light sensor module, which may provide more complex control options by sending serial control commands to the unit. Additionally, connected hosts may be parasitically powered through the communications bus to eliminate the need for separate batteries.