SPI Lighting Inc. is a privately owned company headquartered just north of Milwaukee, Wisconsin. Founded in the mid-1970s, the company produces and sells commercial lighting fixtures under three brands: SPI, Advent and Stile.

SPI is a recognized leader in the manufacturing of high performance ambient lighting systems. SPI produces both symmetrical and asymmetrical products available in a variety of lampings, including LED. These highly efficient fixtures accommodate a number of different optical systems that fulfill demanding energy and performance requirements in a wide range of applications. From small hallways to giant warehouses, SPI has both interior and exterior products for any size project.

Advent is a complete line of architectural grade luminaires available in numerous styles, materials and finishes. This line offers many efficient light sources, including LEDs, and affords designers the opportunity to choose from multiple levels of photometric performance within a single housing. While designed to fit a wide range of styles and tastes, Advent products are intentionally designed to accommodate a designer's individual application requirements, aesthetic or performance based.

Stile is a unique line of fixtures with simple, clean lines designed with today's budget and energy constraints in mind. Utilizing efficient fluorescent and long-lasting LEDs, Stile offers a fresh approach to multi-lamp and single-lamp linear lighting. It also provides various looks in both interior and exterior designs. Complemented by a number of crisply designed wall sconces, Stile offers a new aesthetic for contemporary environments.