08-09-2012, 10:05 PM
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| | Comparison to other lighting technologies See luminous efficacy for an efficiency chart comparing various technologies. - Incandescent lamps (light bulbs) generate light by passing electric current through a resistive filament, thereby heating the filament to a very high temperature so that it glows and emits visible light. A broad range of visible frequencies are naturally produced, yielding a "warm" yellow or white color quality. Incandescent light is highly inefficient, as about 98% of the energy input is emitted as heat.[15] A 100 W light bulb emits about 1,700 lumens, about 17 lumens/W. Incandescent lamps are relatively inexpensive to make. The typical lifespan of an AC incandescent lamp is around 1,000 hours.[16] They work well with dimmers. Most older light fixtures are designed for the size and shape of these traditional bulbs.
- Fluorescent lamps (light bulbs) work by passing electricity through mercury vapor, which in turn emits ultraviolet light. The ultraviolet light is then absorbed by a phosphor coating inside the lamp, causing it to glow, or fluoresce. While the heat generated by a fluorescent lamp is much less than its incandescent counterpart, energy is still lost in generating the ultraviolet light and converting this light into visible light. If the lamp breaks, exposure to mercury can occur. Linear fluorescent lamps are typically five to six times the cost of equivalent incandescent lamps but have life spans around 10,000 and 20,000 hours. Lifetime varies from 1,200 hours to 20,000 hours for compact fluorescent lamps. Most fluorescent lamps are not compatible with dimmers. Those with "iron" ballasts flicker at 100 or 120 Hz, and are less efficient.[citation needed] The latest T8-sized triphosphate fluorescent lamps made by Osram, Philips, Crompton and others have a life expectancy greater than 50,000 hours, if coupled with a warm-start electronic ballast. The life expectancy depends on the number of on/off cycles, and is lower if the light is cycled often. The efficiency of these new lamps approaches 100 lumens/W.[citation needed] The efficiency of fluorescent tubes with modern electronic ballasts and compact fluorescents commonly ranges from 50 to 67 lumens/W. For comparison, general household LED bulbs available in 2011 emit 64 lumens/W,[17] with the best LED bulbs coming in at about 100 lumens/W.[18]
Cost Comparison
Incandescent Halogen Fluorescent LED (Generic) LED (Philips) LED (Philips L-Prize) Purchase price $0.41 [19] $4 [20] $4 [21] $20 [18] $25 [22] $50 [23] Electricity usage 60 W 42 W 13 W 9 W 12.5 W 10 W Lumens 860 570 660 [24] 900 800 940 Lumens/Watt 14.3 13.6 50.8 100 64 94 Color Temperature Kelvin 2700 3100 [25] 2700 3000 2700 2700 CRI 100 100 82 >75 [26] 85 92 Lifespan (hours) 2,000 3,500 8,000 25,000 25,000 30,000 Bulb cost over 10 years – @6hours/day $4.49 $25.03 $10.95 $17.52 $21.90 $36.50 Energy cost over 10 years – @15cents/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)
Your LED light's Lumens is 600. http://en.wikipedia.org/wiki/LED_lam...hold_LED_lamps
Last edited by Nemo the Clownfish; 08-09-2012 at 10:08 PM..
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