Discussion
Which thermal requirement do light emitting diodes have?
Answer: A
Diodes generate heat at the junction and their life collapses if it is not conducted into a heatsink. Output genuinely does vary with temperature, which makes the last option a real characteristic even though the concern is overheating rather than cold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Naming what changes and what stays the same is the reliable route through questions of this shape.
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