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IS IT TIME TO UPGRADE TO LED
2012-07-05 10:20:23

 

Progressively customers are turning their eyes towards LED house lights as a method to save electricity. But will you really achieve the greatest savings by buying this still expensive lighting now? Or would you be better off to save your money for the time being, or to buy other energy-efficient light bulbs, and use the money you save in electricity to buy LED house lights down the road?
 
 Everybody has seen LEDs before: LED Christmas tree lights, wind-up emergency torches, and camping headlamps. How about LED house lights? If LEDs are so effective, why aren't manufacturers lining up to sell LED lights for the home, and why aren't we lining up to buy them?
To be fair, I think LEDs have a ways to go yet, in terms of function, durability, and budget. There are some LED products you should consider over the next year, such as LED Christmas lights. And you might enjoy trying out a couple of LED light bulbs, if you're the energy-saving type. But is this going to save your money? Compact fluorescent lights, or CFLs, are so cheap that they'll pay for themselves.


One thing, LED light bulbs are more efficient than incandescent or fluorescent lighting. The problem is that LEDs have very directed light. An incandescent light shines over an extensive area, while LED lights are very focused, so that the area they directly illuminate is very bright, while the further you go from the direct beam, the less light there is. For LED Christmas lights, that isn't a problem; you just want some shining points of light, which LEDs do very efficiently. But an incandescent or CFL will do a much better job of brightening up your living room than an LED bulb in the same application. The light will be more evenly and generally spread, and with a warmer colour.
 
When it comes to halogen lights, they are only as efficient as incandescent lights, so the same efficiency considerations apply here. But since halogen lights are typically much more direct than incandescent bulbs, LED lights that are designed to replace halogen lights and work well for the direct light that halogen bulbs provide. You can find LED replacement bulbs for the most common halogen fixtures such as GU10 and MR16, and this may be a good place to start the switchover.
 
LED house light designers work around the issue of the narrow beam of a single LED, by building household LED light bulbs that are a collection of individual LEDs, with each diode aimed at a different angle, so that a wider area is highly illuminated. This increases the area of full light coverage of an LED light. However very few such bulbs provide the breadth of area coverage of existing incandescent bulbs or CFLs and at the same time are bright enough.
 
Where LED lights overtake existing bulbs is as replacements for lighting that is highly directed. For example, a light in a narrow hallway, where the chief point of the light is to show people their way down the hall, would be a good application for LEDs.
Task lighting is another example of an application where LEDs shine. Why light up your entire workroom if all you need to see is the tools on the workbench right before your eyes? A couple of LED bulbs hanging above the work area will do the trick nicely. But you can only cost-justify this in energy savings if you live half your life in the workroom.
 

LED light bulbs are, in theory at least, very durable, when compared to incandescent bulbs and compact fluorescent bulbs. LED bulb life ranges from 35,000 to 200,000 hours, compared to 1,000 hours for a good incandescent light, and 8,000 hours for a CFL. But I have seen many consumer ratings of LED bulbs that report burnout within a few days of being switched on. Clearly there are some quality problems still to be worked on - yet another good reason for holding off a couple of years before switching wholesale to LEDs.
 
Whether LEDs will really live up to their long lasting billing remains to be seen - even the 35,000 hour ones would need to be on 24x7 for 4 years before they come close to reaching their advertised range. And LED lights do dim with age - so while a bulb might have a lifetime of 35,000 hours, it won't emit its starting light level for the full 35,000 hours - the older it gets, the less light it will emit. LED lights do decline progressively in light intensity and therefore in efficiency, although they will still be more efficient than either CFLs or incandescent bulbs throughout their life.
 
The "colour temperature" of a light bulb, measured in 'degrees Kelvin', regulates human visual response to its light. You are probably comfortable with the yellowish glow of incandescent at around 2800 Kelvin (2800K), even though fluorescent lighting is closer to the natural daylight temperature of 6000K. Any LED with a temperature of 6000K or higher will seem bluish, and any LED with a colour temperature above 4000K will appear whiter than an incandescent bulb.
 
While homeowners are typically worried about how fluorescent or LED lights can make their rooms look blinding white instead of the comforting yellow glow provided by incandescent bulbs, you should remember that a little sacrifice in colour temperature will put a big dent in your electricity bill. Be a trendsetter, not a trend-follower - start converting your home lighting to true daylight colours, whether with CFL lights or LED light bulbs. You will be helping your family and friends to switch over; when they find out they won't be the only ones with a slightly bluer light hue in their homes.
 
Whether you switch a few of your lights to LED lights now, or let the technology and reliability improve, you can count on the fact that LEDs will play an increasing role in lighting our houses in the years ahead. I personally think it makes sense to wait, except in certain special lighting situations where the direct, high-colour-temperature light of LEDs is what you're after, and where money is no object. If you just want to save money - or to cut your energy use for environmental reasons - an equal amount of money spent on CFLs, or most other energy efficiency upgrades, will cut your energy bills and carbon footprint more than buying the LED lights now available.
 
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