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• Incandescent light bulb
  ...fficacy]] of a typical incandescent bulb is 16 [[Lumen (unit)|lumen]]s per watt, compared with 60&nbsp;lm/W for a [[Compact fluorescent lamp|compact fluore ...78}}</ref> consisting of 2,000 cells housed in the basement of the [[Royal Institution]] of Great Britain,<ref>{{cite web|title=Popular Science Monthly (Mar-Apr 1
  104 KB (15,285 words) - 16:44, 16 December 2018