Dimmers provide more lighting options and reduce energy costs. When designing electric lighting for a particular space, both quantity and quality of light need to be considered. Avoid overlighting a space. In the past, there was a misconception that the more light in a space, the higher the quality. Not only does overlighting waste energy, but it can also reduce lighting quality.
Glare is a visual discomfort caused by an excessive bright light source.
A bright object in front of a dark background usually will cause glare. Too much contrast causes glare and makes visual tasks more difficult. Light sources vary dramatically in their ability to accurately reflect the true colors of people and objects. The CRI is a scale from 1-100, where higher CRI represents better color rendering. Daylight is considered ideal, with a CRI of 100.