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E291是什么作用: Ultra bright red & green T-1 3/4 bi-color LED. Lens clear. Luminous intensity at 20mA 300mcd(min), 700mcd(max)(red); 80mcd(min), 200mcd(max)(green). Forward voltage at 20mA 1.85V(typ), 2.5V(max)(red); 2.2V(typ), 2.5V(max)(green).