The document describes new functions added to the LMS-9000A Spectroradiometer system for testing LED lamps. It can now perform lumen maintenance testing over time as specified by the IES-LM-80 standard, collecting data on lumen, CCT, CRI, power, and other metrics over time. It also allows testing how photometric properties change with different input voltages. The software automatically analyzes the test data and generates curve diagrams and Excel reports.

1. LMS-9000A Spectroradiometer New Functions
Introduction: Optical Maintenance & Electro-Optical
Characteristics
As we known that the quality of LED products depend on lumen, lumen efficiency
temperature and CRI etc parameters, the general test device is application with
spectroradiometer & integrating sphere system to measuring electrical, photometric and
colorimetric parameters. This system mainly testing lumen, CCT, CRI, spectrum, SDCM,
voltage, current, power and power factor etc. As general test device, this system have
better test function to measuring LED lamp at some period, it’s hard to checking the
actual quality of LED lamps after long time used. On the other hand, the customers
became more and more care about the life time of LED lighting products, this is require
some test device have to meet this test demand, and the America Energy Star issued the
IES-LM-80-08 which have clearly defined how to test LED life and guidance rules.
LED life time test which simulation the luminaires lumen output at three different
temperatures, the change of LED colorimetric parameters. After long time lighting on the
LED lamp to collect the relevant data, then analysis it to get final estimate the life time.
The IES-LM-80 have mentioned one of important test, that’s luminaires lumen output
after long time lighting on which at three different temperature environment, we call it
luminous flux maintenance test, the lumen maintenance test is for checking the change
of lumen VS time, CCT VS time and CRI VS time etc. Focus on practice test demand,
Lisun Shanghai designer developed the LM-80 extend test function based on LPCE-
2(LMS-9000A) test software, besides the general photometric, colorimetric and electrical
parameter test, the LMS-9000A Spectroradiometer system have extra two software: one
is LM-80 lumen maintenance test; the second is change of Photometric VS Electrical
test. The LM-80 lumen maintenance test software, that means we can set the constant
220V voltage at software, this software can collect the data of Lumen VS Time, CCT VS
Time, CRI VS Time, power VS Time, Power Factor VS Time, Current VS Time and
Efficiency VS Time, then the software will automatic analysis the data and make a curve
diagram for each group and can export Excel format document. The screen of software
as below:

2. The second is Photometric VS Electrical test software, this is set several different
voltage at software to observe the change of lumen output, that’s lighting LED lamp on
the constant 100V for 10 minutes, the switch constant 150V for 10 minutes, after that
switch others voltage to cycle lighting. The software will collecting these data during cycle
testing and analysis them to get curve diagram and export Excel format document. The
screen of software as below: