From now on the packaging of every light bulbs has to incorporate an “energy label”. This label suggests the following properties the the bulb:

energy efficiency (letter the the alphabet): over there are 7 categories, native A (the most effective bulbs) come G (the least efficient bulbs);light calculation (in lumens): the number to check in order to discover out exactly how much irradiate the bulb provides off;lifespan (in hours): keep in mind that a bulb is used on average for 1,000 hrs per year (about three hours per day).

You are watching: What does the power rating on a light bulb describe

The packaging likewise provides other valuable information about the light bulb, such together its size, the colour of the light, its start time, etc

A label and also a number of promises

Initially, the energy label was presented by the european Union to classify household electric appliances. Now it is used in an ext and more fields: electrical light bulbs, television sets, structures (EPB certificate) , cars, etc. The target is to allow you to offer preference come appliances the use much less energy and also that will cost less throughout their lifespan.

Information on the energy label…


View this image in large.

The most visible information, because of its large lettering and also the grading the the colours, is the energy class of the bulb. The finest bulbs are those in class A, the least great in class G. In other words: A-class bulbs are the many efficient because they use less power than the rather to supply the same amount of light.

Typically, light bulbs are devided into categories (1):

Compact fluorescent light bulbs room in group A or B.Halogen bulbs space in category DIncandescent bulbs are in classification E or F.

Beneath the power category, you will see three figures and also three units:

in lumens (lm), the amount of light (2)emitted by the bulb: the higher the figure, the more light the bulb emits for the same power consumption. For this reason don’t depend on watt when choosing your bulb, but on lumens! To help you, keep in mind that a 110 W incandescent pear emitted 1300-1400 lm if a 25 W pear emitted 220-230 lm;in watts (W), the electric power took in (3). This gives an clues of consumption: the more powerful a bulb, the more electricity it uses. For instance, a 13 W light pear will usage 0.013 kWh (kilowatt hours) every hrs (h), the lifespan (4): be afflicted with in mind the 1,000 hours coincides to around one year’s use;

In enhancement to the power label, the light bulb packaging includes other details that will help you choose:

in millimetres (mm), the dimension of the bulb (5): both the length (including the base) and the diameter room given. This way you deserve to be sure that the bulb is suited to your light fitting;in kelvins (K), the “colour temperature” (6): it tells you the color of the light. A low temperature (less than 4 000 K) shows a warmth light. A high temperature (over 5,300 K) suggests a cold light;in secs (sec.), the start time (7): this is the time it take away the bulb to with 60 % that its irradiate output.the number of times the bulb have the right to be switched on or off(8);the volume of the pear to occupational with a dimmer switch (9).

What around ecological criteria?

While the energy label speak you around the energy performance that the light pear you have bought, it does no say anything around its affect on the environment. You will uncover out a little much more by checking even if it is the pear carries one ecolabel (a blue and also green flower with star-shaped petals).

See more: Why Does Wave Summation Occur? Physioex Muscle Experiments Flashcards

This European label guarantees products that have actually less the an influence on the environment and also which room safe and reliable to use. N.B.: This labelling is voluntary, which way that the product fulfils the environmental criteria collection but is no necessarily the many environmentally familiar on the industry (other products that perform not bring the label may be equally or even much more environmentally friendly).