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LED Uni-Color Red 660nm 2-Pin T-1 3/4
a count of all of the component leads (or pins)
the amount of voltage needed to get current to flow across a diode.
In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.
Lenses are classified by the curvature of the two optical surfaces. A lens is biconvex (or double convex, or just convex) if both surfaces are convex. If both surfaces have the same radius of curvature, the lens is equiconvex. A lens with two concave surfaces is biconcave (or just concave).
a group of products which fulfill a similar need for a market segment or market as a whole.
a particular group of related products.