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|
|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|
|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
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).
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.
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.