MOOOI – Endurance test Heracleum II 7V DC

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

MOOOI has put an led luminaire in form of a branch of a tree, in endurance test. The power supply used is 7.0 V and an additional capacitor is used.

This article presents the endurance test results. The test has run 25,000 hours.

Summary Measurement Data

parameter initially after 9,000 hrs endurance after 25,000 hrs endurance
Color Temperature 2706 K 2708 K 2717 K
Luminous Intensity Iv 81.8 Cd 75.3 Cd 76.0 Cd
Beam Angle 317 deg 317 deg 317 deg
Power P 28.0 W 27.3 W 27.7 W
Power Factor 0.81 0.81 0.82
Luminous Flux 804 lm 740 lm 747 lm
Luminous Efficacy 29 lm/W 27 lm/W 27 lm/W
CRI_Ra 85 85 84
Coordinates Chromaticity Diagram x=0.4588 and y=0.4092 x=0.4586 and y=0.4095 x=0.4576 and y=0.4095

Test duration and test environment

The lamp went into endurance test on 15 Nov 2012 and this intermediate reporting covers until Sept 2015.

During this period of time the lamp has seen little variation in enviromental temperatures: the temperature close to the lamp varied between 15 – 30 deg C in that period. The lamps have been in a corridor in house.

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.


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 150,000 hours.

Color change

The color change (change in color coordinates) is measured during the test period of the first 9,000 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 9,000 hours the color point remains inside an 1-step McAdams ellipse. This is a very good result for constancy of color.

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