BRIGHTNESS CONTROL SYSTEM FOR DECORATIVE LIGHT STRINGS

Apparatus and associated methods relate to providing a constant-brightness lighting power to one or more interconnected light strings. A light string power controller draws operating power from a power source that has a variable voltage. The light string power controller supplies constant-brightness lighting power to the one or more interconnected light strings connected thereto. The power controller can send a load-query signal the one or more interconnected light strings connected thereto. The connected light strings respond to the query with a load-response signal, which is indicative of a power level corresponding to an illumination value of the one or more interconnected light strings. The load-response signal can be indicative of a total number of lighting elements of the one or more interconnected light strings, for example. Similarly, the load-response signal can be indicative of a desired power level for a predetermined illumination level of the one or more interconnected light strings.