Your LED Questions Answered! (Part 2)


Ask an Electrical Engineer is a series where frequently asked questions from non-engineers will be answered by an engineer. For this video, our main topic is all about LEDs (Light Emitting Diodes).

What's covered in this video:

00:18 Are LEDs better than HIDs?

01:29 Are LEDs good for growing "plants"

02:18 Are LEDs directional?

03:17 Are LEDs environmentally friendly?

05:07 Can LEDs be made from Silicon and Germanium?

05:16 Why do LEDs blink or flicker?

06:17 How do LEDs produce white light?

07:22 How can LEDs be used most effectively in a bear attack?

07:42 Are LEDs waterproof?

Tutorial FAQs


What is the difference between COB, CSP and CREE lights?


CREE is a very popular brand of LEDs, kind of like GE or Lumiled are brand names. COB stands for "Chip on Board" which indicates that the LEDs are integrated together more tightly and, as I understand it, earlier in the manufacturing process. Sharing a semiconductor substrate rather than sharing a PCB. CSP stands for "Chip Scale Packages" and is a way of packaging discrete LEDs into something smaller so that you can fit more of them onto a PCB. It basically is getting rid of all of the "unnecessary" plastic and metal that surrounds the LED itself to make the unit as small as possible.

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