<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (December 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> Holiday lighting technology has been subject to considerable development and variation since the replacement of candles by electric lights . While originally used during the Christmas holidays as Christmas lights, modern electric light arrays have become popular around the world in many cultures and are used both during religious festivals and for other purposes unconnected to any festivities . </P> <P> Incandescent light bulbs have been commonly used in holiday lights until recently . These lights produce a broad - spectrum white light, and are colored by coating the glass envelope with a translucent paint which acts as a color filter . Some early Japanese - made lamps, however, used colored glass . </P> <P> Light - emitting diode (LED) holiday lights are quickly gaining popularity in many places due to their low energy usage, very long lifetimes, and associated low maintenance . Colored LEDs are also far more efficient at producing light than their colored incandescent counterparts . </P>

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