LED bulb output lumen measurement with LISUN integrating sphere spectroradiometer system

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An integrating sphere, also referred to as an Ulbricht sphere, is a kind of sphere that is used to measure the total luminous flux (in lumens) that is emitted by a light source. This kind of sphere may also be called an ulbricht sphere. It is built using a spherical chamber that has a diffuse white inner surface that evenly distributes light and a small opening that enables the light source to enter. The inner surface of the chamber is white.

If you place an LED bulb within the sphere, the light from the bulb will illuminate the whole of the space contained by the sphere. As a result of this, it is no longer necessary to make adjustments for angular emission patterns, which are notoriously difficult to measure exactly. This is because this issue has been resolved. A photometer is placed at the opening of the sphere, which is the only location at which the total light output can be accurately measured. After you have taken this measurement, you will be able to compute the overall light output of the LED bulb and express it in terms of its lumens.

When compared to the use of an integrating sphere, traditional photometer methods provide a measurement of the LED bulb's output that is less accurate. This is because an integrating sphere provides a measurement of the total light output in all directions, while traditional photometer methods require the user to take into account the LED's emission pattern. As a consequence, the output of the LED bulb may be measured with increased precision as a result of this.

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