For many, LED bulbs are light bulbs in the future because they consume little energy and their life expectancy is particularly long. But what actually this new generation of bulbs? Are they really Green? They consume little energy? How to choose?
What bulb you choose?
3 criteria must be taken into account to choose an led bulb.
- Light efficiency
It is the amount of light emitted by consumed W. More it is high, more the lamp is effective.
|Incandescent bulb||CFL||Led bulb|
|Power||1W||1 W||1 W|
|Luminous flux||10 lm||50 lm||57Lm|
|Life||1000 h||8 000 h||25 000 h|
Data source: Pauldigo.com
The luminous efficiency of the Leds varies according to light bulbs. However, it is higher than that of CFLs and incandescent bulbs. This effectiveness is still to grow during the coming years.
- Color rendering index
It is the ability of a light source to faithfully restore the color to the human eye. The light of day with by definition an index 100, incandescent lamps have a near 100 IRC and flucocompactes and close to 80 LED lamps.
- The angle of dissemination
A closed angle (35 °) illuminates only a limited area and can suit the lighting of a work plan while a wide angle will be necessary to illuminate a large area (staircase, corridor).
- Where to place the LED lamps?
At the present time, the leds provide only limited light. As such, they can be used as a bedside or desk lamp when their angle of diffusion is low. When the angle of spread is wide, they are particularly well suited instead of passage (hallway, toilet) because the Leds light up immediately.
The ecological impact
According to an analysis by the office of Dutch study ‘This’ bringing throughout the life cycle of the product (from production to disposal), the LEDs are the greener bulbs. They are ahead of CFLs and incandescent bulbs.
The issue of electromagnetic waves
According to the CRIIREM (Centre for research and independent Information on the non-ionizing electromagnetic radiation), the leds emit less electromagnetic fields than CFLs.
What do the Leds at the end of life?
Leds lamps must not be thrown in the conventional garbage. Unlike incandescent and CFLs bulbs, Leds can be recycled. For them to be actually, you can wear them in store or at the recycling center.
The precautions of use
According to Ademe, some blue or white LED develop a blue spectrum which can be dangerous for the retina. A blue LED in a room can disrupt sleep.
The national safety agency recommends to focus on indirect lighting.
To avoid the risk, especially in the presence of children, the specific agency that it is better to favour the warm white LED lighting low ‘light intensity’ systems and avoid lighting systems led where a direct vision of the emitted beam is possible, in order to prevent glare. The Agency also advised against the use of blue-rich light sources in places frequented by children.