If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
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These are really bright LEDs. I am using them on my multicopter to tell the back from the front, and even in bright sunlight these are intensely visible when pointed head on. Very nice.