This document discusses different types of lighting used in interior design, including ambient lighting, task lighting, accent lighting, and decorative lighting. It provides details on each type, such as how ambient lighting provides uniform illumination for a space, while task lighting provides focused light for specific activities. Accent lighting is used to draw attention to design features, and decorative lighting enhances a space's style. The document also covers various lighting fixtures and methods used in offices, such as valance, cornice, cove, track, and soffit lighting. It concludes with a market survey comparing LED, CFL, and other light bulb brands and prices.