Hope I got the right section. First time poster! Hello all! I'm pretty much a Noob so forgive any ignorance. I'm running 31 Orange (2.2v) (24 ma) LED's on a parallel circuit. My power supply is 12v from the DVD power supply of a Xbox 360. I bought a 10 watt 15Ω clay type resistor per a suggestion of a calculator. The LED's are the correct Brightness I wished for but the resistor gets real hot I'd assume 50-60C°(too hot to touch). So logically I don't want to use it as it will damage other components with in the Xbox 360. And I don't want to use a heat sink just for the resistor. The question I have really is what resistor I'll need. I want to use just one and it being one that won't get hot to the touch but still provide the desired LED brightness. Thanks in advance! And sorry for being such a Noob all I know of electronics is trial and error along with google's help. P.S. I did two other projects before and didn't have an issue. I used blue led's and green leds before. I think they were both 32 led's and I ran in parallel but put a 470Ω resistor in between each positive end on the led. But that was way too much work.