![]() ![]() ![]() This is the equivalent to a more traditional incandescent or halogen bulb. In the majority of cases, we recommend going for a bulb with a colour temperature of between 2,700k and 4,200k. What this all means for the lighting in your home If you had the same 1000 lumen bulb concentrated on an area of 10m 2, the area would be dimmer, since the illuminance would only be 100 lux. A light source 1 metre away will appear far brighter than the same light source from 100 metres way.ġ lux is equal to 1 lumen per square metre, so if you have 1000 lumens concentrated on an area of 1m 2 then the area will be light up with an illuminance of 1000 lux. Lux is the measure of the apparent intensity of light hitting or passing through a surface at a given distance. Regardless of how bright a light is, if you are a long way from it, it will provide less light intensity than if you stood right next to it. Remember that the lumen is a unit of measurement for the brightness of light. When replacing your existing bulbs with new LEDs, we recommend using the lumen as a comparison, to ensure your new LED bulbs have a similar level of brightness. ![]() The traditional incandescent bulbs fare worst and the new LEDs are the best. In the table on the right, you can see a list of typical bulbs and their relative luminous efficiency – which is simply the lumens you can expect per watt. However since the advent of low energy lighting, comparing wattage just isn’t feasible since a 5w LED might produce the same number of lumens as an equivalent 40w incandescent bulb. A 100w incandescent bulb is far brighter than a 40w bulb, for example. In the past, consumers relied on watts to get a feel for the brightness of a bulb. A bulb with a higher number of lumens will produce a brighter light, while fewer lumens results in a dimmer light. The lumen is a unit of measurement for the brightness of light. It is possible to get lights with Ra 90+ but as you might expect, the bulbs will cost considerably more. There is obviously no such standard for the home, but the higher the Ra number, the more vivid and lively representation of the object being illuminated. The European Union’s standard for workplace lighting (EN 12464-1:2011) dictates that lighting needs to be a minimum Ra 80. Ra 100 is considered the best and this is equivalent to the rendering provided by daylight, hence many work places are now using daylighting as a matter of course. It is measured on a scale of Ra 0–100 (Ra is sometimes replaced with CRI). Colour renderingĬolour rendering is the ability of a light source to give good colour representation of the colour it is illuminating. If you consider your home, it is likely to be dominated by warm light – halogen GU10 spotlights and traditional incandescent bulbs, conversely offices tend to be lit by more cold light, including things like fluorescent tubes. Typically, we refer to low colour temperature as being ‘warm’ in appearance, while high colour temperature is referred to as ‘cool’ in appearance. Please note that the chart is used just to illustrate the point different bulbs can operate at slightly different colour temperatures, but this can certainly be used as a guide. In the chart on the right, you can see examples of different types of bulbs and their colour temperature. So the colour temperature is simply a numerical value assigned to the colour emitted from a light source depending on the temperature (measured in degrees Kelvin).
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