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Ashron
07-05-2007, 10:57 AM
A friend of mine has an extra 2.2k 4w resistor, he says it will work like the 2.2ohm 5W Tim sells. I was curious if he was right? Also is 2.2 K the same as 2.2 ohm? I have a Green luxeon III and a 9v power supply. I know this is probly a major noob question so feel free to flame away. Thanks in advance for any help :D

Lord Maul
07-05-2007, 11:06 AM
"k" in resistor talk means you move the decimal over on the resistance value 3 spots. it is shorthand for 1000

a 2.2k resistor is shorthand for 2200 ohms of resistance.

short answer = NO it will not work the same, your led will be VERY dim if you use it


a 2.2 ohm isn't the right resistor for a 3 watter with 9 volts. according to the chart (http://www.thecustomsabershop.com/t-resistors.aspx) you'll need a 5.6 ohm 10 watt resistor (http://www.thecustomsabershop.com/pc-887-36-56ohm-10w-resistor.aspx)

Ashron
07-05-2007, 11:33 AM
cool thanks Maul. I thought it sounded weird. What i would need is a 5.6K 10W resistor. I think i'll just stick with the chart, :) less thinking involved.

Lord Maul
07-05-2007, 11:36 AM
no, a 5.6 ohm resistor, not 5.6 k

and the cool thing about the chard is if you click on the resistor you need, it links you to it in the store :wink:

Ashron
07-05-2007, 01:57 PM
ok now it clicked. I think its time for another cup or two of coffee. 5.6ohm is like .0056K. Now I am curious, how large of a power source would you be hooking up to in order to need a 2.2k? LOL