LumitexT has put a set of 20 ledmodules called lumoBOX-XT in endurance test.

This article presents the endurance test results. The test has run 10.000 hours and shows a behavior of first declining light output and then increasing again until initial level.

See here the results of the 0-hours test.

Summary Measurement Data

parameter	initially	after 6000 hrs endurance	after 10000 hrs endurance	remarks
Color Temperature	6869 K	6618 K	6721 K
Luminous Intensity Iv	302.2 Cd	258.6 Cd	322.9 Cd	See remarks at luminous flux
Beam Angle	121 deg	121 deg	121 deg
Power P	16.0 W	15.7 W	15.7 W
Power Factor	0.93	0.93	0.95
Luminous Flux	935 lm	800 lm	1006 K	A reduction of flux as been measured initially during a significant amount of time after which it increased again.
Luminous Efficacy	59 lm/W	51 lm/W	64 lm/W	See remarks at luminous flux
CRI_Ra	77	76	77
Coordinates Chromaticity Diagram	x=0.3082 and y=0.3189	x=0.3112 and y=0.3259	x=0.3096 and y=0.3245

Test duration and test environment

The lamp went into endurance test on 27 Oct 2011 until 22 Dec 2012.

During this period of time the lamp has seen the following ambient temperature and ambient relative humidity.

Period Sept 2011 – Jan 2012.

Jan 2012 – Mar 2012.

April 2012 – July 2012.

July 2012 – Sept 2012.

Sept 2012 – Nov 2012.

The ambient temperature close to the lamp varied between 14-32 deg C and the relative humidity between 15-80 %.

Variation of lamp parameters

The variation of the lamp parameters during the endurance test.

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

No extrapolation to the 70 % level of the luminous flux is possible when using the illuminance as a measure for the luminous flux. The illuminance decreased at first and after 5000 hours started to increase until initial level.

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 could not be done as explained before.

Color change

The color change (change in color coordinates) is measured during the test period.

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 10000 hours the color point remains inside the 4-step McAdams ellipse.