The most noticeable trend in recent years in the field of lighting is certainly the gradual disappearance of the incandescent lamp to the benefit of led lamps. If semiconductor lamps were used exclusively for stairs and walkways or traffic signs buoyage system before, current led lamps are also suitable for functional lighting. According the light technology lab specialists, it is however a bit too early to say that in office buildings, they actually manage to compete with alternatives of lighting lamps.
Laboratory technology light, a group of 15 researchers in the high school KAHO Sint-Lieven in Ghent, is in Belgium the absolute reference in the field of research in terms of light and color and whose most well-known project to the general public is the Groen Licht Vlaanderen consortium, which promotes economic lighting.
“In addition to our missions at the level of teaching and research, we offer our services to companies in the sector of lighting,” says Wouter Ryckaert, which is attached to the laboratory as a professor and head of research of the interior lighting. “We have specific and expensive measuring instruments, which allow us to analyze the products they have developed and improved.”
Attention to the Led Tubes
The lab works nonetheless independently. “We have set up independently a study to analyze for many thousands of hours of operation the various tubes led available on the market”, said Wouter. “There are many ‘entrepreneurs’ offering to sell such lamps businesses realize savings of energy, at a price ranging between 50 and 120 euros the lamp. But often their knowledge of lighting is limited. In some cases, it is true that consumption is actually reduced by half, but what they usually say no, is that often the light intensity is also reduced by about half and that lighting is not homogeneous. As a test, we therefore replaced the fluorescent lights of our meeting room on campus by three led tubes. The power is actually half less, but light intensity changes also from 280 lx intensity very insufficient 150 lx. Led tubes are to be applied usefully in fridges and freezers stores because they work optimally in a cold environment.”
Grace White Light Blue Light Phosphor
Nevertheless, led technology is performing in the field of functional lighting. “This is especially of led lamps Blue high power composed a separate layer of phosphorus, unlike the white leds where the phosphorous layer establishes a direct contact with the diode”, says Arno Keppens, researcher.” Phosphorus is able to convert the short wavelength of blue led light in a broader spectrum that produces a white light. The benefits of these led lamps are their chromatic homogeneity – bright color is practically the same in all directions – and their effective operation. This technology experienced a rapid rise as an illumination of ceiling facing down, called ‘light’ in the jargon.”
Not More Economic
The meeting room of the laboratory has been equipped for the test, a functional led light. “Its price is currently 2-3 times higher than that of the tl lamps, but it must be compensated by a very high life expectancy of 40,000 to 50,000 hours of operation,” says Arno.
Wouter Ryckaert: “led lighting is certainly not cheaper than the tl lamps. In fact, at the level of the number of lumens produced per watt, it is between the lamp economic (50 lumens per watt) and the lamp tl (105 lumens per watt)”.
The Led Also Produces a Huge Amount of Heat!
Functional led lighting also requires a different approach. Contrary to what many think, the led lamp produces a lot of heat. This idea wrong? “In an incandescent lamp, this heat is radiated into the light beam. This is not the case of the led,”explained Wouter. “At the back of the lamp, is necessarily a special cooling system which relatively take much space. And because of this, it is not always easy to design frames led as functional lighting. But a good heat removal is essential for the efficiency and the service life of the lamp. Is there an important aspect in the recessed frames.”
More Interesting Led to the Hard to Reach Areas
It is therefore possible to illuminate spaces of offices and shops with led lighting. But what is the choice of the led ideal? “For general lighting of a regular desktop, the tl lamp remains still the best choice, if you associate an electronic starter and a good frame”, “says Wouter. Right now, it is quite possible to vary the intensity of a tl lamp, but also to equip it with a detector of presence and a twilight probe. To hard to reach places, where the replacement of a lamp is expensive, functional led lighting can be more interesting than the use of lamps tl.”
Hotels, Shops and Museums
The corridors of hotels are the places where functional led lighting is best to apply. “” These places, lamps burn easily 8,000 hours per year and their long service life is very useful “, says Arno.” But also for lighting led in the museums and shops, led lamps are a good choice. Given the small size of the LEDs, you can easily create a beam of light to illuminate with precision certain objects, without submitting them to a radiation of heat. Consider this Baker who exposes her cakes to chocolate in its window. Because the heat release occurs, as we have already said, at the rear of the lamp. In museums, too, the led found to apply because it causes no ultraviolet or infrared, radiation that can cause damage to objects subjected to artificial light.”
A Performance Up to 20%
The functional lighting and signage market offers many opportunities for led technology, but the challenges are great. “For functional lighting, is essential to achieve a high light intensities higher yield”, think Arno.” Led lighting is therefore not yet the most economic solution, but in some cases, it is the best option.”
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