Quote:
Originally Posted by themastr
If your driver is auto ranging you would not need to put in a resistor in series? you said that its ranges from 103v-171v DC. So 44 LEDs X 3.6V = 158.4 v. you're within the range. Now if you are looking to put a resistor in series so you can check the voltage drop and then calculate the current across your string then I think it would be 12.6v/0.7a = 18 ohms
P=IE so you will need to get a P=0.7x12.6 = 8.82 watts minimum rating on the 18 ohms resistor.
someone please Double check this work its been a long time since I built my Led build.
you can also put just a smaller resistor in series so it acts like a single led.
R=E/I = 3.6v/0.7 = 5.14 ohms or a greater resistor and the wattage should be
P=IE= 0.7a X 3.6v = 2.52 watts
I think I used the smaller resistor for mine less heat and doesn't max out the driver output.
hope this helped a bit
But please someone recheck the work. it's been awhile ;D
thanks
erick
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i am using a Inventronics:120W produce 103v-171v range at 700mA.