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Percentage of brightness? Answered

Suppose I want the Red led to emit 70% of its 100% brightness, how do i calculate the resistor, what if I want it to produce 90% of its full intensity ? Thanks

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By using own, you can not reduce voltage as it may make the led switch off. You can not change he current as it may change the efficiency and colour temperature of the led. By using a pen signal of 70% you can make it bright to 70%.

Current controlling is not a wise process, we can use voltage controlling to achieve it