Questions & Answers about LED's

Questions & Answers about LED's

There are many good reasons for using LED’s for lighting, they are energy efficient, robust and have a long lifetime. Here at LED ecolite we would like to explain a few points and hopefully answer some of your questions about LED’s

We believe that LED is the Lighting source of today so
don't get left behind with old expensive light bulbs. LED’s are the light source of today; more and more people are now using them for lighting – both indoors and outdoors.

Depending on your current light source, LED’s are up to 8 times as energy efficient as conventional incandescent bulbs, and with the greatly improved colour rendering it is on a par with fluorescent tubes.

The use of LED’s for lighting has been limited up to now, this has been because LED’s have not been sufficiently energy efficient and the colour rendering has not been able to match the requirements or the standards needed. In recent years there has been a significant improvement thus enabling the use of LED’s more and more. With energy bills on the rise yet again we feel there has never been a better time to switch to LED lighting. Read here for more about energy bills.

High-energy efficiency
Commercially available LED’s are 8 times as efficient as incandescent bulbs, 5 times as efficient as halogen bulbs, and equal to energy saving bulbs – with an efficiency of typically 80-120 lm/W.

Energy efficiency of a light source is calculated by looking at the quantity of light emitted by the light source (the lumen package), and the energy consumption of the light source (in Watts). Energy efficiency is stated in lumen per watt (lm/W). When calculating the energy efficiency of a light source, you should always remember that the energy consumption of a light source includes the power loss in the transformer, electronic ballast unit or driver, this is also know as the “control gear loss”.

Switch on instantly
LED’s switch on instantly and provide their full strength immediately, none of the tedious waiting for the light bulbs to warm up. The small components in LED’s are suitable for dimming the lights, and the light doesn’t change colour when dimmed, which is what happens with incandescent and halogen lights. Most of our LED light bulbs sold today are capable of being dimmed.

Colour properties

The colour properties of any light source are relevant to white light, and are described as colour temperature (expressed in Kelvins, you will see this abbreviated as K) and the colour rendering index (CRI) or Ra index. The CRI ranges between 0 and 100 and indicates how good the light source is at reproducing a number of reference colours. A CRI of 100 is the best.

The light from LED sources is either warm (typically 2,700-3,000 K), neutral (3,500-4,500 K) or cold (4,500-10,000 K). A comprehensive selection of LED’s is available with a CRI of over 80. The best LED’s have a CRI of over 90.

Longer lasting
LED’s have a lifetime of between 25,000 and 50,000 hours. The lifetime depends to a large extent on how they are used. High temperatures and high current loads can quickly take their toll on an LED, which is the same as any ordinary electronic component.

Unidirectional light
LED’s project all their light forwards, whereas the most common light sources emit light in all directions, most of the time this is wasted light. This is why LED bulbs are best suited to lamps that project light in one direction, such as spotlights and lamps that solely light downwards.

More about LEDs
If you would like to read more about the technical background for designing with LED bulbs or fittings with LEDs, then have a look at our Design& Installation page.  

When you need to design light sources or luminaires with LEDs, you should be aware of a number of issues if the light source or luminaire is to work properly. If you need any further advise on LED products and are still unsure what you buy then give one of your team a call here at LED ecolite

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