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Renewable energy field. Led lighting

Led bulbs are modern low-consumption bulbs based on LED, or Light Emitting Diodes, which are some components employed for years in the consumer electronics as stand-by signs of televisions, video recorders, etc. and in many domestic appliances or devices.

 

For some years some diodes have been created with high brightness firstly used in traffic lights and tail lights of cars. Nowadays, they are also used in order to realize several bulbs, with low and high voltage, for any kind of application.

 

Led bulbs transform in light 93% of electricity consumed, while only 7% is scattered as heat, so this allows to save – issued light being equal – up to 80% of electricity than a traditional incandescent bulb.

Besides, they have a lifetime until 100.000 hours, than 1.000 of an incandescent bulb and 10.000 hours of fluorescence bulb.

Led bulbs have a high light efficiency (50-60 lm/W), 5 times higher than the incandescence ones, that is to say that they transmit more light, power being equal.

However, the luminous flux does not provide a correct indication of the light perceived: for this purpose illuminance may be used(measured in lux), a parameter which measures the concentration of the light transmitted on a specific surface: the value of illuminance depends on the way in which the light is spread, as well as the power of the light source. As led are directional sources, in their case this value is the double.

Besides, led – and so the led bulbs – has a considerably long lifetime, from 50.000 to more than 100.000 hours (these are equal to 11 hours of use 24 hours per day).

Although it does not exist an industrial standard which can define the lifetime of led, the main companies fix the deadline when the led reduces its brightness up to provide 80% if the light transmitted in the beginning.

According to the luminous flux transmitted by the bulbs to replace, it is possible to choose the led of correct power.

Electric consumption

Luminous flux (lm)

Compact fluorescent

fluorescent

9-13 W

40 W

450

13-15 W

60 W

800

18-25 W

75 W

1.100

23-30 W

100 W

1.600

30-52 W

150 W

2.600

Led bulbs have low maintenance costs, as led are very strong mechanically and bulbs keep on working even if someone of the dozens of led of form part of them is damaged, but unlike the traditional bulbs, led does not burn: the intensity of the light is simply reduced.

Thanks to the great illuminance which is characteristic of bulbs and led, it is possible to replace them and the fluorescent lighting(compact or neon) with led equivalent consuming less energy, that is to say of less power (in watt). In this way, there is a great saving of money.

For example, it is possible to replace a standard neon bulb of 40 W (T8 of 26 mm and with lenght of 120 cm) with a “led tube” (made of 300 little led) consuming within 17W.

In this case, assuming a cost of electricity of 0,15 €/kWh and an everage use of 6 hours per day, the annual consumption with the two different bulbs would be, respectevely, of 87,6kWh and 37,2kWh.

Therefore, the annual saving in using the led instead of the neon fluorescent would be of 50,4kWh, and so 7,5€.

In addition, the longer lifecycle of the led bulb is to underline, which is more than doubled than any other kind of traditional bulb.

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