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It depends on the color of the led you have.

Normally it changes between 1.5 V and 2.5 V. But if you need to use white or purple leds those leds need more power like 4-5Volts.

Im gonna calculate for a standart red led, a red led needs 20 mA and 2 volts to light up. So we know the formula that we can calculate how many watts does the led need,

P = U * I

P = 2 * 0.02 = 0.04 W.

I used the average values. I hope I didnt make any mistake :)

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