Renewable Energy

Lemnis Lighting Asia – Endurance test 120 cm glass led tube

Posted by Marcel van der Steen in Endurance Test Add comments

Lemnis Lightings Asia has put a glass led tube in endurance test.

This article presents the endurance test results. The test has run more than 11,000 hours.

See also the results of the 0-hours test.

Summary Measurement Data

parameter initially after 9,000 hrs endurance
Color Temperature 5289 K 5631 K
Luminous Intensity Iv 670.8 Cd 664.6 Cd
Beam Angle 123 deg 123 deg (tested after 7,200 hours, not again after 11,000 hours)
Power P 21.7 W 21.5 W
Power Factor 0.91 0.91
Luminous Flux 2312 lm 2291 lm (computed using Iv at 11,500 and 0 hours and luminous flux at 0 hours)
Luminous Efficacy 106 lm/W 107 lm/W
CRI_Ra 95 94
Coordinates Chromaticity Diagram x=0.3380 and y=0.3487 x=0.3292 and y=0.3440

Test duration and test environment

The lamp went into endurance test on 9 April 2013 and this intermediate reporting covers until 31 July 2014.

During this period of time the lamp has seen the following variation in enviromental temperatures and humidity: the temperature close to the lamp varied between 8 – 30 deg C and the humidity betwen 25 – 80 %. The tube has been in a garage.

Variation of lamp parameters

Screen Shot 2014-08-09 at 10.00.44

The variation of the lamp parameters during the endurance test.

See the explanation on the OliNo site for more on the test method.

The extrapolation to the 70 % level of the luminous flux is not possible when using the illuminance as a measure for the luminous flux (the level is basically constant).

Screen Shot 2014-08-09 at 10.00.34

Extrapolation of the illuminance.

See the explanation on the OliNo site for more explanation and the link to the ASSIST document for the method of extrapolation.

The extrapolation of this data until 70 % of illuminance is reached goes to very high numbers of hours. We can extrapolate until 5 – 6 x the tested time, so the 70 % luminous flux quantity is expected to happen after 35,000 hours.

Color change

The color change (change in color coordinates) is measured during the first 7,200 hours.

Change in color coordinates during the endurance test.

The color coordinates indicated with the red cross-hairs are the coordinates after 1000 burn hours. These are taken as reference. After 7,000 hours the color point remains inside an 2-step McAdams ellipse. This is a good result for constancy of color.

One Response to “Lemnis Lighting Asia – Endurance test 120 cm glass led tube”

  1. mvdsteen Says:

    @ xpower: two items are of interest:
    1) The extrapolation to the 70 % level, this results in a number of hours burned.
    2) de variatation of the color point, this results in a shift within a xx step McAdams ellipse.
    I explain the results of both items in the text.
    Whether the results are good enough for any application in particular that depends from the application.
    For instance when you use a light for general lighting then a 5-stap McAdams ellipse would be good enough. However when you use the lights for directly illuminating a billboard then 2 steps would be preferred.
    For lifetime also it depends on the amount of usage per year and the difficulty of changing/servicing a light bulb.

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