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LED lighting facilitates education in Africa

 

It has only been 20 years since Africa was introduced to the cellphone. In that time, millions of people have gained access to a communication tool that has changed lives and kept friends and families in touch in places that would never have been reached by land lines.

A similar kind of revolution is taking place in Africa – lighting. Light is key to the social fabric of most societies – allowing people to meet, socialise and work after dark. In so many villages across the continent, light is either provided by fires, paraffin lamps or candles. Electricity is a luxury for many – either not available or too expensive to connect and use.

If you’ve ever tried to read a book by candlelight or the flicker of a paraffin lamp, you’ll know that after a while, the low light level and the flicker will tire out your eyes. Yet millions of students study by candle light or paraffin lamps every day. Until now there just hasn’t been an alternative.

Enter a low energy consumption light source (LED lights), a mechanism to create power (solar cells) and a cheap way to store energy (rechargeable batteries).  While solar and battery technology has been around for some time, led lighting has only recently become viable with higher lumen outputs that make their performance acceptable. But that is not the only reason that change is about to accelerate. What will drive the change is the cost reductions in all three technologies.

In fact, with ever increasing oil prices trading off against technological breakthroughs and scale advantages of these new technologies, pricing is coming within range of “affordable”. A 2 watt solar cell with a battery and a series of small LED lights can light up a small house and now with improvements in quality and longevity, the upfront cost of purchase can be recovered very quickly. Thereafter, the lighting is effectively free and plentiful. All this thanks to the amazing low power consumption of led lights. With over 100 lumens per watt now becoming the standard, just 3 watts can light up a desk or a kitchen area with enough light to see and work by.

Besides the cost recovery angle, the quality of the led lights is far superior to the alternatives anyway, and so students can study with cool white light that does not stress the eyes.

As we move through 2012, and the cost of led lighting declines, and new technologies impact the solar cell and battery components, expect to see led lighting move through Africa at a rapid pace. Perhaps not as fast as the cellphone, but like the cellphone, it will bring welcome changes to the social and educational environment in Africa.

An article by LED Lighting Solutions

 

 

 

 

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Saving money by doing nothing? What kinda scam is this! No scam actually. It’s easy and you can read about it here in this published article.

 

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LED lights? What is the fuss all about you may well be asking. “LED ???” … what the heck does that mean? Here’s a quick, light (sorry!) look at this thing called the “LED light”.

An example of an LED light used to replace standard lighting bulbs

An example of an LED light that replaces a 60W incandescent light bulb

First, let’s begin with the meaning of LED. LED stands for Light Emitting Diode… and even a non-rocket scientist (like me!) can work out that the main thing to note is that it “emits light” . It does this when a power source (like a battery) is applied to its two input terminals and it does so because the boffins have worked out how to get the now powered up little electrons to give off light as they move through the material that makes up this “diode” thing. They have been around for years…but until recently they have been used only as “indicating” lights (e.g. is the TV, cellphone, kettle, hifi etc  on or off) and not for illumination. So they are that little colored plastic light in your hi-fi, hair dryer etc that comes on when you turn the power on.

The electronics of an LED are not important here, just that you need to know that when you attach a power source like a battery or electricity, the result is an electron flow that results in light being emitted.

The catalyst for their development into lights was the realisation that they use very little power to create light. Take your cellphone. That little light that flashes to tell you that it is “on” is not about to drain your battery in a hurry. So some clever people thought “hey, if this thing uses so little power, what about making a light bulb out of them?”.

Problem. Until recently, the amount of light that they could generate was very, very small. So you’d have to connect a room full of them together to get anything near a light that could replace the standard globe above your head.

But, along came even more clever folk who were able to increase the lumen output (call that a measure of light given off) from 3 lumen per watt of electricity to 30 lumens…then 50 lumens and now we are at 100 lumens per watt in commercial applications. I hear the “even more clever” people have prototypes at over 300 lumens per watt. So watt you say!

Well here’s the buzz – a standard 60W incandescent light (which most of us use for lighting) gives off about 700-800 lumens… so that is just 13 lumens per watt. Much of the electricity goes to generating heat in the incandescent bulb…and anyone who has tried to change an incandescent bulb that has been on for a while…will know that! Ouch!

So if we can get the same amount of light that a 60W bulb (60 x 13 lumens/watt= 800 lumens)  puts out with an LED light that requires only 8W (8 x 100 lumens/watt) of electricity, we stand to radically reduce the electricity consumption of that light. That is the beauty of the LED light.

So less power = less cost for the consumer and less carbon dioxide emissions from that power station down the road because only 1/8th of the electricity needs to be generated from coal. Very “green” indeed!

Brilliant! So why are we not ripping out our globes (after they have cooled…of course!) and fitting LED globes?  Well, this is a new technology and at present, the cost of manufacturing the LED lights is still higher than most consumers are willing, or in today’s times…”able…” to spend. There is …um…light on the horizon though, as performance is increasing and costs are coming down. Mainstreaming of the technology will occur in the next 3 years I reckon.

Now when you look at an LED light, you will notice that the base looks quite “heavy”. The reason for this is that the electronics that help make the light work, can generate heat. The problem here is that the more heat that is generated, the more likely the electronics will eventually pack up. So those clever folk in the R&D labs have developed aluminium heat sinks, or ways to get the heat away from the electronics. The aluminium carries the heat away, and because it has a large surface area with all those fins or folds, it allows heat to move off into the air around it. That is why the base looks “heavy”.

That said, LED lights convert 80-95%  of the power into light so they actually don’t get very hot at all. This saves further electricity usage in that air conditioners are not required to cool down the warm air that the incandescent lights are creating (not an advantage in Alaska maybe…but anywhere else it could be quite a saving!).

So there we have it. A new technology that makes low cost lighting possible; reduces carbon emissions and has some other advantages (like they don’t give of ultraviolet light) that add to the positives.

The negatives are that as a disruptive technology, not all products on the market will work as promised and quality varies significantly from manufacturer to manufacturer. I replaced a 50 W halogen spotlight with an LED and ended up staggering around the room trying not to bump into anything! Not at all the equivalent lumen output that the manufacturer had promised, and had I not known better, I may have rejected LED lighting as a “con” and become cynical about this new “ponzi” scheme! Fortunately, I have some really great lights that have adequately replaced the power guzzlers… ahh…that reminds me…the other BIG advantage is that LED lights can last for 50000 hours before they become dim (gradually over time they do go dim… but they don’t  ”burn out” every 1000 hours as do incandescent lights do ). Now if you just use your bedsite light for an hour a day… it means that you’ll die before your 50000 hour LED light will! Imagine leaving your bedside light to your loved ones in your Will..!

So all in all, a technology with a very promising potential. Watch this space in the years ahead… could be just as wonderful and as useful as cell phone technology. The difference is that LED lights won’t be helping your work to follow you everywhere you go! ….

Was this useful? Send comments or post questions on my Facebook page at  http://www.facebook.com/pages/LED-Lighting-Solutions-Africa/314497688585093

By Steve Giddings

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