Lemnis Lighting Asia presents an LED Tube Light with glass tube, put into an endurance test.

This lamp has been measured at zero hours (new state) before it went into the endurance test.

This article presents the endurance test results.

Summary Measurement Data

parameter	initially	after endurance	remarks
Color Temperature	5084 K	5019 K	Neutral white
Luminous Intensity Iv	378.5 Cd	379.5 Cd
Beam Angle	118 deg	120 deg
Power P	10.8 W	10.6 W
Power Factor	0.92	0.92
Luminous Flux	1194 lm	1238 lm
Luminous Efficacy	111 lm/W	117 lm/W
CRI_Ra	92	93
Coordinates Chromaticity Diagram	x=0.3451 and y=0.3687	x=0.3472 and y=0.3689

Test duration and test environment

The lamp went into endurance test on 13 Dec 2011 and the test lasted until 1 Sept 2012.

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

Sept 2011 – Jan 2012.

Jan 2012 – Mar 2012.

April 2012 – July 2012.

July 2012 – Sept 2012.

The ambient temperature close to the lamp varied between 15-32 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.

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 is not completely true, see the initial table (beam angle slightly bigger).

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 >> 30.000 hours before the L70 is reached.

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 6000 hours the color point remains well inside the 4-step McAdams ellipse.