LED indicator explained: current, brightness, lifetime myths and driving electronics

An LED indicator is a current‑driven device, so voltage markings are only approximate forward drop, not operating parameter

Running an LED at half its rated current can increase its lifetime by an order of magnitude or more

Human eyes perceive LED brightness logarithmically, so small current changes can look huge while large changes look minor

Many multicolor indicator LEDs actually share a single common lead, complicating direct driving from microcontroller pins

Even when appearing off, multiplexed LED indicators can still flicker at kilohertz rates invisible to most people
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