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What resistor I hould use with 12 led in series? Answered

I have 12 leds (1,5v 100mA each) connected in series powered by 18v. Should i use any resistor? Which one? Should I use a resistor for each led or just one for all the series block?
Thank you!


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6 years ago

I've allways used this calculator for a decent sized array. It sugests a (39 Ohm 1W) But Don't take my word for it and try the calculator yourself. It a really great tool !

May I ask where you found these? Kinda funky stats on them :P