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FAQ

This page contains information that may be useful when deciding on your LED Downlights.co.uk products.

 

 

What is LED lighting?

 

Light-emitting diodes have been around for years.

Traditionally, they have been used as indicators on electrical devices, such as standby lights on TVs. This was because LEDs were only available in red, but recent advances means that other colours are now available, and the light emitted is much brighter.

White light (used for general lighting) using LEDs can be created via a number of techniques. One example is mixing red, green and blue LEDs.

It is suggested that LEDs can last for up to between 50,000 to 100,000 hours, compared with the 1,000 hours of traditional incandescent light-bulbs and compact fluorescent lamps' (CFLs) 15,000 hours.

The technology is also much more energy efficient, using up to 90% less energy than incandescent bulbs.

The long lifespan and low energy use make LEDs economically attractive because even though the fittings cost more, the running and maintenance bills are lower.

(From BBC 16/12/2011)

 

 

How are LED lighting products different from other lighting, like fluorescent or incandescent?

(EnergyStar info)

 

LEDs emit light in a specific direction, whereas an incandescent or fluorescent bulb emits light — and heat — in all directions. For direct lighting applications LED lighting uses both light and energy more efficiently. For example, an incandescent or compact fluorescent (CFL) bulb inside of a recessed can will waste about half of the light that it produces, while a recessed down light with LEDs only produces light where it’s needed.

Incandescent bulbs create light by passing electricity through a metal filament until it becomes so hot that it glows. Incandescent bulbs release 90% of their energy as heat.

In a CFL, an electric current is driven through a tube containing gases. This reaction produces ultraviolet light that gets transformed into visible light by the fluorescent coating (called phosphor) on the inside of the tube. A CFL releases about 80% of its energy as heat.

LED lighting products use light emitting diodes to produce light very efficiently. The movement of electrons through a semiconductor material illuminates the tiny light sources we call LEDs. A small amount of heat is released backwards, into a heat sink, in a well-designed product; LEDs are basically cool to the touch.

 

 

Compact Fluorescent Light Bulbs (CFLs) and Mercury

(EnergyStar info)

 

Because CFLs use less electricity than traditional light bulbs, they reduce demand for electricity; that reduction means less greenhouse gas emissions (including less mercury) from power plants. Nevertheless, mercury is an essential element in the operation of fluorescent lighting; it allows the bulbs to be an efficient light source. Because CFLs contain trace amounts of mercury, it is possible that the mercury they contain could be released either into the air or from land-fill when they are released into the wider environment, also could cause a problem if they are disposed of in a normal waste-bin. So, it is important to educate yourself on proper use.

 

 

How to Calculate LED Watts to Incandescent Watts 

 

Incandescent bulbs are everywhere, for the moment --- but they're so inefficient governments and utilities want to get rid of them.

When discussing lighting, it's important to remember that watts are a measure of electrical power, and lumens are a measure of usable light output. So, when you talk about watts of a light bulb, you're asking how much electrical power it uses. Usually, for a light bulb, you're really concerned with how much light it puts out, which is measured in lumens. To compare different light sources, you can put both of those numbers together to create a number called the efficacy. Efficacy is measured in lumens per watt, and it's a measure of how well a lamp converts electricity to light.

Compare the electrical usage, the lumen output, and the efficacy of your selected incandescent bulb to your selected LED bulb. For the example, the comparison of the 60-watt incandescent to the LED is:

     Electrical power usage: 60 Watts to 8.43 watts. Incandescent about 7x LED.

     Light output: 800 lumens to 434.7 lumens. Incandescent about 1.8x LED.

     Efficacy: 13 lumens per watt to 52 lumens per watt. Incandescent about 1/4x LED.

So, for this case, the LED uses only 1/7 as much power, is four times as efficient, and puts out a little more than half the light of the incandescent.
 

 

 

How long can a LED light last?

 

Most of our LED lights lifespan are up to 50,000 hours.

Based on 50,000 hours of operation to work out:

24 hours per day =  5.7 Years

18 hours per day = 7.4 years

12 hours per day =  11.4 years

8 hours per day =  17 years

6 hours per day = 22.8 years

4 hours per day = 34.2 years

 

 

 

What does "IP Rating" mean ?

 

IP Rating (Ingress Protection Rating) is to classifies the degrees of protection provided
against the intrusion of both solid object and water in electrical enclosures. This rating
aims to provide users with more detailed information than by vague
marketing terms such as "outdoor or water-proof". IP Rating consists of the letter IP
followed by two digits and an optional letter. The digits indicate conformity with the
conditions summarized in there reference table of IP Rating Code.
Example of an IP Rating Code
IP 6 6
A component with this IP code indicates that a component is protected against ingress of
dust completely(first number 6); and is protected against harmful effects due to water
powerfully jetted against the component from any direction (second Number 6).

               

 

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