C segment - najbolja kupovina

vladd: I najboljem slucaju, sama lampa je radjena u Kini, a verovatno i ceo asembly. GE moze da zahteva ulaznu specifikaciju za proizvod, i da bude odredjenog kvaliteta.

vladd:  s obzirom da je konstrukcija VW fara pravljena za halogenu sijalicu.

vladd: 
Mislim da im je radni vek oko 6000 sati, godine nisu bitne..

Poz

General Electric moves production from its lamp plant in Virginia to China

LED Lifespan
LED lifespan is perhaps the single most misunderstood aspect of LED lighting technologies. The misconception dates back to a time when many people believed in the 100,000-hour life span. Although LED lights may survive this long, it will not produce nearly as much light as it did within its first few hours of operation! As the LED bulbs age, the luminous output will continuously degrade. This degradation is due to growing defects within the molecular structure of the die. Overtime, the LED lamps become less efficient at producing light. In addition, lens yellowing can also decrease the luminous output as the LED ages. Lens yellowing occurs from ultra-violet radiation as it passes through the epoxy lens. This is why ultra-violet (UV) LEDs have a very limited lifespan and may not be suitable for LED home lighting projects. The intense ultra-violet radiation causes lens yellowing at an accelerated rate.


A traditional light bulb has reached the end of its life when the filament breaks. As we all know, the light output goes to zero when this event occurs. The white LED life behaves much differently! As it ages, the light output slowly and continuously decreases as the LED lamp losses efficiency. The light emitting diode has reached the end of its life when its light output reaches 50% of the rated luminous output, not when it reaches zero. This is the industry standard used for determining white LED lifespan, as well as other colors. The disadvantage of this standard is that the average person cannot judge when the LED light has reached the end of its life. The luminous output will diminish so gradually, most people do not even realize a loss has occurred. Furthermore, a person exposed to a particular LED light on a regular basis becomes less susceptible to its continuously decreasing output. Fortunately, the life of LED light bulb will last long enough that many will even outlive their applications.

Life of LED Light Bulb
It seems that recently, manufactures have improved the accuracy of their LED datasheets. Some manufactures mention specifics about lumen maintenance within a specific period of operation. Lumen maintenance simply defines the expected luminous output after a specified period of continuous use. For example, a manufacture may claim 60% lumen maintenance at 45,000 hours. Of course, this information is subject to conditions such as die temperature and ambient temperature. On occasion, life expectancy data depicted as a line graph is available upon special request. This form of white LED life data offers greater resolution. Rather than defining luminous output during a single point in time, the line graph offers a luminous output for nearly any point within the LED lights lifespan. Life expectancy data is a critical aspect to every custom LED lighting design. Lunar Accents Design Corporation does not recommend purchasing LED lights from a manufacturer who does not offer LED life lifespan data. Most of the time, a manufacturer will conduct a physical test over a shorter period, in order to gain the initial life of LED light bulb expectancy data. However, since an LED lamp can actually produce light up to or exceeding ten years, engineers rely on extrapolated data to determine the luminous output beyond physical lifespan test results.

LED Lifespan
White LED life span can vary according to environmental and design related items. White LED lifespan is ultimately determined during the engineering phase of a specific custom LED lighting design. In some cases, design engineers may intentionally limit LED lifespan in lighting applications where longevity is non-critical. One case includes an application designed to operate only for a specified period. Perhaps more common is the application where light output is more important than the life of LED light bulb. Overdriving an LED lights will increase the luminous output, but dramatically decrease lifespan if thermal management is not considered. It is possible that budgetary restrictions will not allow for advanced forms thermal management. Poor thermal management can expose LED lights to unnecessary heat, and heat can lead to a dramatic reduction in lifespan. In addition to LED lifespan data, LED manufactures need to provide test data pertaining to the specific die temperature during the lifespan test period. Although many LED manufactures do not publish such data, it is important to inquire before attempting to calculate longevity for your custom LED product.

LED Environmental Factors
Although die temperature plays the most critical role in LED lifespan, numerous other variables also play a part. Yet another consideration includes the environment in which the lighting application will operate. Ambient temperature is always a factor, primarily in applications exposed to fluctuating environmental factors. High ambient temperatures and humidity can potentially lead to a reduction in lifespan. For example, consider an LED lighting application designed to produce a 200-lumen output. Twenty surface mount LEDs will meet this criterion, but only while operating at or below the specified ambient temperature of 25 degrees Celsius. When employed within an environment as hot as 40 degree ambient, thermal stresses may dramatically reduce LED life and reliability. Increased ambient temperatures will also adversely affect luminous output. The solution is to reduce the drive current and increase the total number of LEDs within the array.

Bitno je da POSTOJE kvalitetni proizvodi, koje ni najbolji GOLF nikada NECE videti u svojim farovima,

Bitno je da POSTOJE kvalitetni proizvodi, koje ni najbolji GOLF nikada NECE videti u svojim farovima

THE WINNER
Even as it sees out its twighlight years, we still love the Mk6 Volkswagen Golf GTI. As a hot-hatch combining a high-quality, feel-good interior with handling and performance a motorist of any level or driving interest can enjoy, the GTI remains unsurpassed.

But with the sixth-generation Golf effectively being a major update of the Mk5 out since 2004, a fresh look and approach is needed – and the seventh iteration of the GTI is now keenly awaited for its release sometime in the second half of 2013.



And if you’re a driving enthusiast wanting to occasionally head to the race track, it’s the Ford Focus ST and Renault Megane RS265 that will deliver the greater involvement and bigger thrills – not least because the GTI is relatively slow in comparison.

It’s a ridiculously tight call between the Ford and Renault. The ST is stunning value for money – cheaper than all its key rivals yet with a standard features list longer than any – and is a superbly balanced car complemented by a terrific engine and the best seats in the hot-hatch business.

But it’s once again the French that prove they are the undisputed masters of the hot-hatch genre. The Renault Megane RS265 can justify its extra premium over the ST with more than just quicker performance. This is a car that redefines front-wheel-drive handling.

Kvalitet onoga sto se ugradjuje u Golfove je osrednji sa tendencijom ka jos losijem, jedno dve klase su bolji od "najgorih" na trzistu. Od te "osrednjosti" do PRAVOG, sertifikovanog kvaliteta, je koracic od nekoliko evra po komadu...
Sto manageri VW-a nece dopustiti ni u najludjoj nocnoj mori..

vaske2:
Odlično pitanje,ima nas još zainteresovanih za sličnu kupovinu...

I mene lično interesuje da li je A3 sportbek bolji toliko koliko je i skuplji od Golfa6...Radi se o automobilima sličnog godišta i kilometraže,oba kupljena ovde novi s tim što je moj izbor 1,6 tdi od 105ks(koliko je uopšte ovaj motor zahtevan za održavanje...). Ukoliko je pitanje off u ovoj temi,recite da otvaramo novu???

vladd:
Po meni, golf 5 je bolji od golfa 6. Ali sustinski je bolji mladji i ocuvaniji polovnjak od starijeg i raubovanog..