Hato Lighting Solutions – Endurance test Led Luminaire

Posted by Marcel van der Steen in Endurance Test No Comments»

Hato Lighting Solutions has put an led luminaire in an endurance test.

This article presents the endurance test results. The test has run 21.500 hours and still runs.

Update Jan 2015: the test has run for over 31,000 hours and the graphs are updated.

Summary Measurement Data

parameter initially after 21.500 hrs endurance
Color Temperature 3928 K 4009 K
Luminous Intensity Iv 57.5 Cd 51.9 Cd
Beam Angle 360 deg 360 deg
Power P 14.2 W 13.5 W
Power Factor 0.93 0.93
Luminous Flux 683 lm 616 lm
Luminous Efficacy 48 lm/W 46 lm/W
CRI_Ra 80 80
Coordinates Chromaticity Diagram x=0.3862 and y=0.3891 x=0.3822 and y=0.3857

Test duration and test environment

The lamp went into endurance test on 26 April 2011 and the result presented here are after more than 31,000 hours of test (test still running) on mid Jan 2015.

During this period of time the lamp has seen variations in ambient temperature of 8 – 30 deg C an in ambient relative humidity of 25-80 %.

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.

The extrapolation to the 70 % level of the luminous flux is possible when using the illuminance as a measure for the luminous flux. This only was possible after 8,000 hours of endurance test.


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. However for this lamp the extrapolation is done after 8,000 hours of endurance test.

The extrapolation of this data until 70 % of illuminance is reached is after 80,000 hours.

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 more than 31,000 hours the color point comes just outside the 2-step McAdams ellipse. This is a good result for constancy of color.

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