About LED modules
LED module is a basic element of illumination frame or device with LEDs. Each module contains LEDs and electronic substrate. Additionally it can be equipped with:
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connections that help to connect wires,
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electronic elements (e.g. resistors, current stabilization circuits, control circuits),
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lenses to focus LEDs' light,
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mechanical elements that make module montage easier.
About MCPCB substrates you can get know from our article: Thermal management (PL).