Lighting One, a St. Louis, Missouri-based independent lighting showroom cooperative of retail home-lighting stores, has added four new members to its network of more than 130 national showrooms: Lighting by Design in Jessup, Maryland; Idaho Lights in Couer D'Alene, Idaho; Evergreen Lighting in Spokane, Washington; and Olson Lighting in Holly Hill, Florida.

All stores in the Lighting One network remain independently owned; however, each showroom can combine purchase volumes and other resources to receive discounts and services reserved for larger companies. Lighting One started in 1999.