• Lighting Knowledge
   
  a.Power comparison table  for LED bulb, compact fluorescent lamp, and incandescent lamp

  	LED Bulb	Compact fluorescent lamp	Incandescent lamp
  Rated power	7W	10W	100W
  Luminous flux	560LM	513LM	565LM
  Luminous efficacy	80LM/W	64.8LM/W	9.8LM/W
  Service life	50,000hrs	5,000-7,000hrs	1,500hrs
  Environment friendly(No HG)	Yes	No	No

   
  2)Energy saving comparison for LED bulb, compact fluorescent lamp, and incandescent lamp

  	LED Bulb	Compact fluorescent lamp	Incandescent lamp	Remark
  With the same luminous flux	7W	10W	100W	1.     Suppose that 10hrs for each lamp each day use 2.     0.16usd/kwh
  Power consumption per hour	0.003kwh	0.007kwh	0.045kwh
  50,000hrs Power consumption	150kwh	350kwh	2250kwh
  50,000hrs Energy charge	24usd	56usd	360usd
  Service life	50,000hrs	5,000hrs	1,500hrs
  Change times in 3000hrs	1	10	33
  Purchase cost	9usd	1.5usd	0.5usd
  Total cost	33usd	57.5usd	360usd

  
  3)Efficiency comparison for LED lights, compact fluorescent lamp, incandescent lamp and other light sources

  	LED light	CFL/FL	Incandescent lamp	High pressure sodium lamp
  Luminous efficacy	130lm/w	60lm/w	20lm/w	100lm/w
  Power supply efficiency	95%	65%	/	50%
  Lighting efficiency	85%	60%	60%	55%
  Light fixture efficiency	90%	60%	60%	51%
  Service life	50,000 Hr	1,800Hr	1,800Hr	6,000Hr

  
  Then the actual efficiency of each lighting fixture is calculated out as below:
  LED light: 130lm/w*95%*85%*90%=94.48lm/w
  CFL/FL: 60lm/w*65%*60%*60%=14.04lm/w
  Incandescent lamp: 20lm/w* 60%* 60%=7.2lm/w
  High Pressure Sodium Lamp:100lm/w*  50%* 55%* 51%=14lm/w
  
  It can be seen that, the actual efficiency of LED light is 6.7 times that of CFL/FL, 13 times that of incandescent lamp,6.7 times that of high pressure sodium lamp.

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