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The other aspects of the "Lighting, Economics and Ecology" file: When lighting meets ecology. Light on low energy bulbs. Natural lighting. Recycle his bulbs.

LEDs in the spotlight.

Dossier ecological lighting: LED lamps: lighting

As their name suggests, LED (Light-Emitting Diode) lamps consist of light-emitting diodes. Invented in Russia in the 20s, they remain in the shadows until the 60s, or an American researcher propels them on the front of the stage. Since then, this small electronic component has continued to evolve, starting as a small light in the appliance to finish recently in our light bulbs. To make your own opinion on these new lamps, this week, HandymanDuanche takes you into the world of LED lamps.

How it works?

Dossier ecological lighting: LED lamps: bulbs

The diode emits a monochromatic light when it is traversed by a continuous electric current. It consists of a silicon crystal semiconductor, mounted on a cup-shaped support that reflects light more or less directionally according to its shape. It is divided into two negatively doped zones for the one and positively for the other, at the junction of which the light is emitted. By playing on the doping components, it is possible to influence the wavelength of the emitted light, and thus to change the characteristic color of the diode. In the case of a white LED, a phosphor layer will be used to transform the monochromatic light into polychromatic light. Finally, everything is included in an epoxy resin envelope that protects the whole.

The different models.

Dossier ecological lighting: LED lamps: bulbs

With the most varied shapes and sizes, LED bulbs combine several high-brightness LEDs and adapt to all types of decorations. Screw, bayonet or connector, their caps have a wide range of choices to integrate on a maximum of lamps. Inside, outside and even hiking, LED lamps meet all our lighting needs. LED bulbs can be colored, white or even multicolored, by combining several diodes of different colors.

Advantages.

Dossier ecological lighting: LED lamps: dossier

The new LED bulbs are as environmentally friendly as they are economical, with a yield of up to 100 lumens per watt for the most efficient. They thus offer unprecedented energy performance, also have a considerable lifetime of 100,000 hours and are resistant to shocks as well as repeated ignitions. Finally, they contain no substance harmful to our health and are easily recycled.

The inconvenients.

With poor light, the first generation of light bulbs and low-end models produce relatively weak and pale lighting, often compared to that of a night light. Their fragility in the face of heat puts a brake on the evolution of their power and claims on the most luminous models of the heat dissipators. They are also accused of poor color rendition for a purchase price five times higher on average than conventional models.

Increasingly present on the market, LED bulbs are constantly improving while their prices tend to decrease over time. If it is now possible to find models with a warm and strong lighting, regret that we still have to put the price.

The other aspects of the "Lighting, Economics and Ecology" file: When lighting meets ecology. Light on low energy bulbs. Natural lighting. Recycle his bulbs.


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