www.LED  Ledshift .com




All Infos about LEDS, leds, led lights, Led, Oled, Diode, Led Infos, LED News, energy saving lamp, Led Shops Funktion of a LED, leds, led lights, Led, Oled, Diode LED NEWS, LED-info, LED INFO e-zigarette, e-cigarette Furnituretips with LEDS, leds, led lights, Led, Oled Homedesign with LEDS and Oleds LED light show, OLED light show, LEDbuildings around the globe Energy saving with LEDS and Oleds Funstuff with Leds and Oleds LED Stripes LED Fashion, clothes with Leds and Oleds LEDS for the car, LEDS for the Auto, Led Auto NEWS, LED CAR NEWS, Led Headlight, Led Daylight lights, Led carlights, Led blinker, Led stoplight LEDS für das Motorrad, LEDS für das Bike LEDS for Boot, Leds for your Yacht, Led Anchorlights, LED Boatlights, LED underwaterlights, LED Navigationlights LEDS for plants, led growinglights, growing lights, LED growing light, Leds for your plant, all infos about  LED growing lights, Led Shop, LED GROW SHOP Veranstaltungen German.html LED Monitore, LED Backligtht, LED LCD, LED Display, Oled Display, Oled Monitor Environment idea Box, interesting ideas for a better environment The biggest LEDSHOP in Europe, Ledshift is using 33% of his Shop income for karitative propose! de

3 step`s to the right LED
LED Colors
It becomes Light
Color temperature K
Color nm
Luminous intensity cd
Luminous flux lm
Illuminance Lux
Luminance L
The Photon
Semiconductor
Luminescence
Design
Current
Resistance
Oled
Livespan
OVERVIEW
Producer
Distributor
We recomend:



































LIVESPAN of an LED

Degradationskurve The light degradation of an LED is defined as the time, in which the luminus flux (lm) falls below 50% (median)of the measured origin luminus flux with defined ambient temperature and passage current.

LEDs are not only energysaving and shockproofed they also have an enormously long lifespan up to 10.000.000.000 hours.
This value is produced however only on laboratory conditions. Usually the lifespan of one „household LED“ amounts between 10.000 and 100.000 hours. And that´s a big different!

LEDs behave however not like a bulb, with that the shining wire mostly „breaks“ but the luminus flux (lumen) of an LED decrease with the time. This continuous change is measurable and designated as DEGRADATION.

This light degradation is also as „lumen maintenance“ (L) mentioned.

LIVESPAN:

3 factors play here the decisive role.

Degradation  The main cause lies in the enlargement of defects in the crystal, which supply on thermal influence, as to high temperature. These defects do not participate any more in the light generation and the LED lose in luminus flux, thus in brightness.

Degradation  The second cause, which plays however a subordinated role, is the turbidity housings or the lenses if these are manufactured of plastics. Such turbidity arise however appears only with gallium nitride LED within the blue and ultraviolet range.

Degradation  The 3 cause can be a malfunctioning due the symptom of fatigue in the used materials. For example, fatigue symptoms of sticking or ground connections.
These malfunctionings are described under the term „Mortality“(B) or total failure. At 100,000 hr. in the data sheet e.g. if B50 is located to an LED, this means that 50% of all test lamps has failed after 100,000 hr. Sometimes also the B10 value is indicated. That means from which time 10% of the test lamps dose not longer to function.

How the Degradation is indicated?

Degradation


The light degradation of an LED is defined as the time, in which the luminus flix (lm) falls below 50% of the measured origin luminus flux with defined ambient temperature and passage current (L50). Many manufacturers indicate this value also as t50.
In addition, many LED manufacturers indicate ever more frequently a degradation of L70 or L80, which means that with a luminus flux loss of 30% (L70) or 20% (L80) the life span was exceeded.
For an LED if one life span is e.g. indicated by 50.000 hours, for a light degradation by L80, this does not mean for the final consumer that its LED makes after 50.000 hours „puff “and is broken, but that its LED only delivers after 50.000 hours burning duration still 80% original luminus flux. That is a lumen loss of 20%.

The Delegration by malfunctioning or also Mortality mentioned, gives the time and the portion of the failed construction units on (B50). This value has however mainly in the test phase of an LED a meaning and is in data sheets mostly not found.





Philips Lumileds LM-80
Philips Lumileds First to Publish Lumen Maintenance
- LM-80 - Test Report Online + LM-80 Report + LM-80 Charts



LEDShift NEWS

20.Okt.2009: LM-80 test reports are no longer a mystery. Philips Lumileds is now providing the LM-80 test report for its latest LUXEON Rebel LEDs online for everyone to access.

Lumen maintenance data is essential for predicting and understanding how LEDs will perform in actual use conditions.

















Google
 











  AGB Ledshift   LED Function   LED Producer   LED Distributor   LED Events   LED Company Entry   LEDS   Sitemap   Contact         


© Markus Kottas, Heldenberg Ltd.2018