How to Choose Energy Efficient Light Bulbs

How to choose light bulbs more energy efficient? The offer is wide between the LED, the CFL or halogen eco to replace incandescent bulbs doomed to disappear.

Energy Efficient Light Bulbs

New technologies

The whole of the illuminating part is actually called “lamp”. But the term “bulb”, which designates only the glass envelope, is entered in the customs.

The incandescent, greedy, gives way to the efficient bulbs: less than 7 W incandescent bulbs are not allowed since the September 1, 2013; 1 September 2016, all incandescent bulbs including the halogen will disappear, deemed too energy-intensive. Other types of bulbs take over.

LED, the solution for the future

  • Consumption of a LED is unbeatable: up to 80% energy saving compared to an incandescent bulb.
  • Another benefit, a very long life span: 10 000 to 30 000 hours of light, i.e. 10 years minimum.
  • His luminous power keeps improving to provide a real enlightening power.
  • It does not heat up and can position itself on all types of luminaires.
  • White or colored lights: there are the led flares to illuminate a living room or balisantes LED, more decorative, ideal for the markup of a staircase for example.

Energy saving bulb

  • The CFL also called light bulb low consumption or even energy saving bulb is versatile for lighting inside and outside.
  • With a life expectancy ranging from 6 000 to 12 000 hours, she takes 6 times longer than an incandescent bulb.
  • It consumes 80% less than an incandescent bulb.
  • Exists in many powers and color (hot and cold) temperatures.
  • Ideal in living rooms where they stay on for a long time.

Good to know: QuickStart technology enables the bulb to reach 60% of its maximum power within 30 seconds, so light up almost instantly.

Halogen eco

The halogen bulb is now available in economic version.

  • It consumes 20-30% less than a conventional halogen bulb, and offers a color rendering and light equivalent.
  • Life expectancy: 1 to 2 years.3 times more than a conventional halogen bulb.
  • With instant ignition, these bulbs are compatible with a dimmer, a detector of presence or passage.

Good to know: eco 12 Volts, little energy-consuming, halogen bulbs offer a stronger light than a standard halogen energy consumed equivalent.

Fluorescent tube, said neon

  • The neon has always been energy-saving.
  • It provides about 12,000 hours of performance.
  • That is why it is regularly used in offices, laundry rooms, or garages.

Incandescent bulb

There is currently 4 large families of lamps for home use.

Incandescent bulbs standard, economic to buy but expensive electricity and low life expectancy, use 5% of the energy used to illuminate. The remaining 95% turn into heat.

More bulb uses his energy to light, less hot and more she is profitable.With the eco, your lighting lamps consume about 5 times less electricity!


Several indices define the quality of lighting.
Lumens, the amount of light

For the same consumption expressed in watts, all bulbs do not produce the same amount of light.

  • The luminous flux(amount of light emitted) is measured in Lumens (lm).
  • The more Lumens, the more the light bulb lights up effectively.
  • On the packaging, it is now preferable to rely on this number of Lumens.

Good to know: a 60-watt incandescent bulb has a light output of 710 Lumens. It is now possible to get the same amount of light, or more, with an energy saving of 15 Watts bulbs or B22 LED bulbs of 12 Watts.
Watt, power

The Watt is the unit of measure for the electric power produced by the bulb.

  • The more watts, the more the light bulb consumes electricity.
  • As for performance, the ability of a light bulb to transform electrical energy into light energy may differ from one model to the other.To take into account the number of Lumens produced per Watt consumed.

Example: a 23 Watt energy saving bulb which produces 1 500 Lumens has an output of 65 Lumens per Watt.

Good to know: the bulbs also have their energy rating. Energy efficiency is set a (for a very powerful performance) to G (for the less powerful performance).

Candela, the light intensity

The Candela defines light intensity, or the importance of the luminous flux emitted in one direction.

  • She expresses the ability to shed a light as a spotlight with reflector that spreading its light output with different intensity according to the directions.
  • The intensity of a lamp so depending on its angle opening: it is tight, the more the candelas increase.

Color rendering index

It comes to IRC. He expresses the ability of the lamp to restore the true colors.

  • He is graduated from 0 to 100.
  • 100 being close to the light of day.

Tip: for a light nice and decorative in a living room, better is worth close CRI of 100. For the more functional spaces like hallways or kitchen, around 80 CRI is recommended.

The Candela defines light intensity, or the importance of the luminous flux emitted in one direction.

  • She expresses the ability to shed a light as a spotlight with reflector that spreading its light output with different intensity according to the directions.
  • The intensity of a lamp so depending on its angle opening: it is tight, the more the candelas increase.


It is important to well familiarize themselves with the new criteria of choice of light bulbs low consumption.

Bulbs are available with units standard (to screw or bayonet) or special (in single or double braces).

The beam (angle of light) affects the efficiency of the lamp and light rendering (more or less accentuated light effect).

The lumen (Lm) measures the amount of light emitted by the bulb.
At Leroy Merlin, it’s about the diffuse light to wide beam (39 ° or +).

The candela (cd) measured the brightness perceived by the human eye.
At Leroy Merlin, it’s about the light directed at narrow beam (-39 °). The color temperature (in degrees kelvin, or K) indicates if the bulb emits a light, soft, hot or cold. The choice is a matter of taste.

  • Warm light: Orange, usually around 2700 K yellow appearance.
  • Cold light (also called daylight): aspect blue, usually around 6500 K.
  • Soft light: white appearance, usually around 4000 K.

Index of color, IRC (in french) or CRY (in English), is a concept difficult to grasp. Two bulbs with the same index can provide a different rendering, one distorting some cool colors warm colors. The ballpark: between 80 and 100 (index of the light of day).


The saving energy, eco and LED halogen lamps exist in many forms and with the different units designed to adapt to all types of luminaires.

Shape of a light bulb

  • The bulb can take a variety of forms according to the need and the desired decorative function: big light bulb, halogen pencil, spherical in form of flame, conical, spiral, spot, bulb, tube…
  • Various finishes of the globe: white striated, amber streaked, white Crystal, silver Cap…

Types of units

  • Screw: small E14 or E27 great.
  • Bayonet: B22.
  • Single or double spindle: GU5.3, GU4 or GY6.35.
  • GU10: specifically dedicated to the spots.

Good to know : you can compose his own light bulb by choosing a technology, a nerve and a globe to put on.


Glass, plastic, metal or fluorescent powder that make up the bulbs must be deposited in a recycling network to prevent the pollution of soil or any groundwater for example. The WEEE directive (waste of electric equipment and electronic) organized the collection and funding (by taxing the bulbs on the purchase price) of waste, including light bulbs.

Attention: in case of breakage of a recyclable light bulb, remember to ventilate the room to avoid breathing the harmful gases.

How to recycle the bulbs?

Incandescent and halogen bulbs do not recycle and must be thrown in the trash. On the packaging of other bulbs (LED, neon, energy saving bulbs), featuring a crossed out trash, recycling is necessary. Suitable containers have been created to collect the used bulbs. They are available in stores that sell bulbs as well as in the waste.

The energy charge

To encourage a driving green t help equip you the most fuel-efficient technologies in energy (up to 90% energy savings), Leroy Merlin makes you get a discount of 1 euro on all light bulbs LED LEXMAN 15 000 H. The store prices already reflect this discount.