Wall sconces can provide indirect lighting, downlighting or general, diffuse lighting. Many wall sconces and diffusers contain incandescent lamps , but also may accomodate pin-based compact fluorescent lamps or screwbase compact fluorescent lamps . For maximum efficiency, select sconces and diffusers that use fluorescent lamps. Luminaires designed solely for compact fluorescent lamps are available, too. Avoid the excessive brightness that may occur when high-wattage lamps are used.
Direct glare occurs when lamps are poorly shielded.
Luminaires that provide diffuse light are appropriate for use in hallways, dining rooms, living rooms, and bedrooms, but they cannot be relied upon to light areas where people sit to read or sew. Avoid using sconces or diffusers near visual tasks such as television viewing and the use of computers because these shiny surfaces may reflect the image of the luminaire. Install the outlet box for the luminaire at least 5.5 feet above the floor. Switch sconces of diffusers separately to provide flexibility, create visual interest, and achieve energy savings. Use dimmers to add ambiance.