Abstract: Modular lighting systems having light heads, lighting poles or stands connected to and transferring power to the light head, a power pack connected to and transferring power to the lighting pole or stand, and a light meter in communication with the power pack. Power-transferring and data transferring modular light poles or stands, having telescoping portions, conductors of power and data therein, and first and second mounts. Power packs for modular lighting systems having casings, communication devices adapted to communicate with a light head or a flash head, and first and second mounts.