AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Luminous flux11/30/2022 The voltage drop that occurs depending on the length of the LED strips is supposed to be compensated by the IC. In the case of the LED Star Strip, this is particularly thick and therefore also conducts the current more lossless. However, this cannot be attributed to the resistors and ICs, but rather to the different thicknesses of the copper conductors. The residual voltage was 22.11 V for the LED Star Strip and only 20.89 V for the LED Essence Strip. The input voltage was 24.10 V for both strips. We chose the LED Star Strip 900 with constant luminous flux technology (IC) and the LED Essence Strip 900, which is operated with resistors.įirst, the input voltage of both modules was measured immediately after current injection, followed by a measurement of the voltage at the opposite end of the 10 metre long LED strips (denoted here: residual voltage). Is it really a visible difference whether an LED strip is operated with a resistor or with an IC?įor this purpose, we used two of our LED strips for the test and measured their luminous intensity curve at a length of 10 metres each. This constant luminous flux technology is also gentler on the LEDs because it also protects the LEDs from overvoltage during operation. As a result, the LED module glows homogeneously at the same brightness even over longer lengths. So, voltage drops can be compensated by these ICs within a certain voltage range. These tiny circuits are current regulators that supply LEDs with the correct operating current and keep it at a constant level even if the voltage varies slightly. In higher-quality strips, ICs are often attached to the conductor track instead of – or in addition to – the resistors. However, the resistor cannot compensate for a voltage drop over the length of the LED strip, so that the LEDs become darker with greater distance from the electrical supply. These resistors set a static operating point of the LEDs at nominal voltage. Most LED strips are usually equipped with resistors. Depending on the manufacturer, there are different identification features, such as the number of solder joints.īut what is the technical difference between an IC and a resistor? Whether an IC or a resistor is soldered on is difficult to recognise at first glance - especially for laymen. This is called constant luminous flux technology, which Radium also uses as standard in the production of LED Star Strips. In order to counteract such decreases in luminous flux, so-called "ICs" ("Integrated Circuits") can be used instead of the otherwise common resistors on the LED strips. Otherwise, the emitted light loses brightness towards the end of the module. However, it must be ensured that the LEDs are supplied with sufficient voltage over the length of the strips. J.With linear LED strips, beautiful homogeneous light can be realised for many applications.The following members of TC 2-17 took part in the preparation of this technical report: The publication contains 58 pages, with 9 figures. The terminology follows that in the International Lighting Vocabulary. The report is based on and replaces CIE 025-1973, Procedures for the measurement of luminous flux of discharge lamps and for their calibration as working standards, and on the conclusions of the CIE Symposium on Light and Radiation Measurement 1981. It then deals with the principles of luminous flux measurements and describes methods for the evaluation of the illuminance distribution, the measurement of luminous flux by means of an integrating sphere photometer and the determination of luminous flux via luminance, luminous intensity and luminance measurements. This technical report defines the terminology required for luminous flux measurements.
0 Comments
Read More
Leave a Reply. |