Endurance test – Actie groenlicht TL 150 cm
Posted by Marcel van der Steen in Endurance Test, Light measurements Add comments
Actiegroenlicht presents a 150 cm long ledtube, equipped with 420 leds.
This lamp has been measured at zero hours (new state) before it went into the endurance test. This tube is powered from one side with 230 V AC. However it is tested in a tube holder with a power factor compensation capacitor which resultsin a lower power factor; when this tube would have been connected directly to the power grid it would result in a very high power factor of > 0.9.
This article presents the endurance test results.
Samenvatting meetgegevens
| parameter | initially | after endurance | remarks |
|---|---|---|---|
| Color Temperature | 6618 K | 7150 K | Cold white |
| Luminous Intensity Iv | 892 Cd | 567 Cd | Went a little up at beginning and then quickly down. At the end of the endurance test it seems to stabilize. |
| Beam Angle | 105 deg | 104 deg | Almost no variation. |
| Power P | 21.9 W | 21.7 W | Almost no variation |
| Power Factor | 0.23 | 0.23 | No variation. It is low becuase it was used in a tube holder with compensation capacitor. With direct connection it would be > 0.90. |
| Luminous Flux | 2349 lm | 1475 lm | It went down quickly and seems to stabilize. |
| Luminous Efficacy | 107 lm/W | 68 lm/W | |
| CRI_Ra | 77 | 80 | |
| Coordinates Chromaticity Diagram | x=0.3110 and y=0.3260 | x=0.3045 and y=0.3119 | |
| Measurement Report (PDF) | to be confirmed |
Test duration and test environment
The lamp went into endurance test on May 2010 and the test lasted until June 2011. This is almost 9,000 hours.
More info on the temperatures and humidity the lamp has seen.
Different periods and relative humidity and temperature.
The ambient temperature close to the lamp varied between 3 – 37 deg C and the relative humidity between 30 – 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.
An extrapolation is done to get to the 70 % illuminance value. The illuminance value straight underneath the lamp is expected to be the good indicator of the total luminous flux. When this illuminance drops with 30 % then the luminous flux is expected to drop as well with 30 %. The assumption is here that the beam anlge and the radiation diagram remains the same. This has been checked, see also the initial table.
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 result is about 4,000 hours before the L70 is reached. But the results seem to stabilize after wards to about 60 %.
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. The y-color coordinate drops in value and is the reason why the color point wanders outside the 4-steps McAdams ellipse.
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