Phengodes sp. (Glowworm) ♂.
Size: approx. 15 mm. Photo: 03/28/16, 9 pm.

A really awesome glowworm that was attracted to our porch light. Adult females appear to be larviform (hence the name glowworm) and can emit light. Males have striking, branched antennae to detect the female pheromones; reduced elytra (forewings), and large bulging eyes. The UF link lists the following species for Florida: P. fuscipes floridensis (mainly restricted to the south-central part), P. f. intermedia, P. laticollis meridiana, P. nigromaculata, and possibly P. plumosa.  
bug guide (this photo):
Mike Quinn: