Abstract: A universal LED light module (ULLM) that can be used in nearly any conventional or nonconventional lighting application, with module interchangeability for enabling user customization of light color and lighting function. The ULLM includes a set of axially aligned batteries with axially opposed terminals, at least one LED cell with axially opposed terminals sandwiched between two of the axially aligned batteries, and a transparent or translucent sheath radially enveloping the batteries and the LED cell to bind them together and environmentally seal them from external moisture and foreign matter. The ULLM may be activated by an external circuit or may additionally include an integral conductor that selectively bridges the exposed battery terminals. The ULLM may additionally include a lighting function element having a form factor that matches that of the batteries, and disposed in axial alignment with the batteries within the radial sheath.

Abstract: A gravity-based angle sensor apparatus includes an outer housing (which may be incorporated into a carpenter's level or other reference frame) that contacts or is fastened to a workpiece, and a sensor assembly rotatably mounted within the outer housing. The sensor assembly includes a frame having internal cavities for supporting a LED light module and a sensor responsive to the orientation of the sensor assembly. The sensor electrically bridges two terminals of the LED light module to activate an LED indicator lamp when the sensor assembly has a reference horizontal orientation.