Comparison With Alternative Technologies
Solid-state lighting using light-emitting diodes (LEDs) now fills many specialist niches such as traffic lights. Recent consumer availability of household LED lights now compete with CFLs for high-efficiency house lighting as well. LEDs providing over 200 lm/W have been demonstrated in laboratory tests and expected lifetimes of around 50,000 hours are typical. The luminous efficacy of available LED lamps does not typically exceed that of CFLs, though there have been LED lamps available for purchase with better than 90 lm/W overall luminous efficacy at least since early 2012. U.S. Department of Energy (DOE) tests of commercial LED lamps designed to replace incandescent or CFLs showed that average efficacy was still about 30 lm/W in 2008 (tested performance ranged from 4 lm/W to 62 lm/W). Solid-state lighting continues to improve; in June 2011 the 8 products in the A-line bulb configuration that DOE tested ranged from 50 to 97 lumens per watt, with an average of 62 lumens/watt.
General Electric discontinued a 2007 development project intended to develop a high-efficiency incandescent bulb with the same lumens per watt as fluorescent lamps. Meanwhile other companies have developed and are selling halogen incandescent bulbs that use 70% of the energy of standard incandescents.
| Cost Comparison | ||||||
|---|---|---|---|---|---|---|
| Incandescent | Halogen | Fluorescent | LED (Generic) | LED (Philips) | LED (Philips L-Prize) | |
| Electricity usage | 60 W | 42 W | 13 W | 9 W | 12.5 W | 10 W |
| Lumens | 860 | 570 | 660 | 900 | 800 | 940 |
| Lumens/Watt | 14.3 | 13.6 | 50.8 | 100 | 64 | 94 |
| Color Temperature Kelvin | 2700 | 3100 | 2700 | 3000 | 2700 | 2700 |
| CRI | 100 | 100 | 82 | >75 | 85 | 92 |
| Lifespan (hours) | 2,000 | 3,500 | 8,000 | 25,000 | 25,000 | 30,000 |
| Bulb cost over 10 years @ 6 hours/day | $4.49 | $25.03 | $10.95 | $17.52 | $21.90 | $36.50 |
| Energy cost over 10 years @ 15 cents/kWhr | $197.10 | $137.97 | $42.71 | $29.57 | $41.06 | $32.85 |
| Total | $201.59 | $163.00 | $53.66 | $47.09 | $62.96 | $69.35 |
| Comparison based on 6 hours use per day (21,900 hours over 10 yrs) | ||||||
Read more about this topic: Compact Fluorescent Lamp
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