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# When connecting LED's in parallel is it better for each LED to have a resistor or a single resistor at the start? Answered

I am trying to wire 27 LED's in Parallel so that they can work independently of each other.

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## 7 Replies

shams (author)2011-10-03

Each led must have separate resistor.Its a must !...If your having problem with calculating resistor value give me your specs I can calculate for you

Tzoul (author)2012-02-28

Thank You! Would you solve my problem? I am using a 14.8v power source to light 16 bi-colored leds in a parallel. I understand I need 32 Resistors, but what strength? My led specs are like this: 2.9v draw, 25mA, Please help. When I enter this into the many resistor calculators Ive found on the web, they give me such incredible resistor suggestions, however I wonder if this accounts for each led. Another thing I can not rap my mind around is that: occasionally I will have both colors on at the same time. How do I figure that into all this resistor calculating.
The leds are three pronged and 5mm, thanks in advance.

shams (author)2012-02-29

by strength are you saying about wattage ? If so you can use 1/4 watt or 1/8 watt resistors.And you dont actually need 32 resistors !!...just connect a resistor on the common pin of the LED ..if your leds are common anode then put resistor on anode ,if it is common cathode then put resistor on cathode.

Tzoul (author)2012-02-29

Thank you shams,

I sorry I didnt provide enough info to start. The leds are bi color three leads 2 anodes and 1 cathode. Im hooking up 16 of these monsters to a 14.8v power supply. Im inserting a "house lamp" switch; this will give me the option to have one color on at a time or both on (both green and blue "on" makes its it more of a white light). Because of the bicolor nature of this project I must wire in "Parallel". Now! everyone says " when wiring it is best for each led to have its own resistor, makes sense. The 5 online "resistor calculators" I've been exploring, dont account for this rule. What you think?

steveastrouk (author)2011-08-31

Single resistor with each LED.

What are you trying to do ?

Steve

Kaisei13 (author)2011-08-31

A game board. Each piece would contain an led and when place on the board they with light up with the players color. I haven't worked much with LED's before so I'm not sure if this will work how I want it too.

steveastrouk (author)2011-08-31

That's the way then.