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This is marketing gobbledygook and Streamlight should be ashamed of themselves. "C4" is short for "controlled collapse chip connection", an industry standard method of attaching electrical components to circuit boards.
C4¬Ocontrolled collapse chip connectionªºÁY¼g¡C(¹ï¡I¥|­ÓC¶}ÀYªº¦r¹À¡C)
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So instead of "C4" being any specific LED or LED technology, Streamlight is advertising the method used to solder the LED down.
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C4 LEDÀ³¸Ó¥u¬O»¡¡AStreamlight¥Îcontrolled collapse chip connection³oºØ»sµ{¡A¨Ó§âLED¸Ë¸m¨ì¹qµ©¤W­±¥h¡A¦p¦¹¦Ó¤w¡C

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C4¡]controlled collapse chip connection¡^¬OIBMªº±M§Q§Þ³N¡A
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