Hybrid vehicle design circuitry quantifies values for utilitydisutility variables of a hybrid vehicle design by evaluating a hybrid vehicle model over a collection of drive cyclesroutes. Current is permitted to flow to the lighting fixture when the temperature of the self heating thermal detector is sufficient to avoid deterioration of electrical components such as plastic parts and wire insulation in the associated fixture. The tilt angle \u201cA\u201d between the plane of the GaN supporting base and the plane of a buffer layer 33a is 0. The internal endpoint comprises a plurality of feature activators for activating a plurality of switch-based features, and each feature activator has an associated feature activator identifier andor an associated feature identifier.