Which one of the following statements is 'WRO | vedclass

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(D) An $LED$ (Light Emitting Diode) is a semiconductor device that emits light when an electric current flows through it.$1$. LEDs are known for their

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Brightness of light emitted by $LED$ cannot be controlled.

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(D) An $LED$ (Light Emitting Diode) is a semiconductor device that emits light when an electric current flows through it.$1$. LEDs are known for their long operational lifetime when manufactured correctly.$2$. The light produced by LEDs is monochromatic or specific in wavelength, and the colours do not fade over time.$3$. LEDs are highly energy-efficient compared to traditional incandescent or fluorescent bulbs.$4$. The brightness of an $LED$ can be easily controlled by varying the amount of current flowing through it (using techniques like Pulse Width Modulation or simple current limiting).Therefore, the statement that the brightness of light emitted by an $LED$ cannot be controlled is '$WRONG$'.

Which one of the following statements is '$WRONG$' regarding $LED$?

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