From the test light scattering of light by Goniophotometer machine. There are many factors that need to be controlled in terms of standard for test is to test tube has no dust or even prints one who change or tube experiment to wear gloves every time. And the wall, ceiling, floor, as well as various devices in the room. Must have low albedo or none at all. Make everything ภายในห้องนั้น have painted black to reduce the reflection of the object. If the objects inside the testing room, the reflected light will make the experiment error. As well as to adjust the temperature 25 degrees Celsius. And not to open the door into the testing room while walking test machine to prevent แสงจา outside into the room. The outcome of the trial was that will be a Photometic report IES files by can read the results obtained from the program, Photometic Toolbox.
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