Since the time of Thomas Edison, incandescent light bulbs have been the dominant light source for illumination. Today, incandescent bulbs still hold crucial advantages. They produce a warm white light and can be dimmed easily using inexpensive controls. They have a relatively inexpensive first-cost per lumen, a long-established infrastructure, and do not contain hazardous materials such as mercury. However, because of their relatively low energy efficiency, incandescent bulbs are being replaced. (source: spie.org)
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