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Author Topic: Green Cree in series  (Read 1895 times)

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Offline Wickedreamz

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Green Cree in series
« on: February 24, 2015, 09:54:47 AM »
I plan on running 2 green Crees in series with a forward voltage of 3.58 each on 7.4v battery. When I input my numbers to calculate a resistor into http://led.linear1.org/1led.wiz im getting a warning that my forward voltage is suspiciously high.

Should I be concerned with the setup or will i be okay?

Also, LED wizard recommends a 1ohm, 2w resistor for my setup. Should I try a different resistor with a higher ohm?

For reference im inputting 7.4v battery source, 7.16 forward voltage, and 1000 ma
« Last Edit: February 24, 2015, 09:56:31 AM by Wickedreamz »

Offline LUMINARA UNDULI

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Re: Green Cree in series
« Reply #1 on: February 24, 2015, 10:00:37 AM »
If you up the resistance, you are essentially lowering the current available and they will not be as bright.  Is there a soundboard in the mix, or is this a stunt?



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Offline PhoenixJedi

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Re: Green Cree in series
« Reply #2 on: February 24, 2015, 10:26:36 AM »
I plan on running 2 green Crees in series with a forward voltage of 3.58 each on 7.4v battery. When I input my numbers to calculate a resistor into http://led.linear1.org/1led.wiz im getting a warning that my forward voltage is suspiciously high.

Should I be concerned with the setup or will i be okay?

Also, LED wizard recommends a 1ohm, 2w resistor for my setup. Should I try a different resistor with a higher ohm?

For reference im inputting 7.4v battery source, 7.16 forward voltage, and 1000 ma

You actually do NOT want to use a 1ohm resistor. It will substantially lower the current. You want to get yourself a 0.2-0.25 ohm resistor from mouser (if you want to use a resistor), or use no resistor. Also, I use ledcalc.com to accurately calculate the actual resistance to get 1000mA at the voltage. It shows the actual needed resistance, and recommends the next highest resistor. Ignore the higher resistor value, because it would cut the current down to 240mA.
« Last Edit: February 24, 2015, 10:35:06 AM by PhoenixJedi »

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Offline Wickedreamz

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Re: Green Cree in series
« Reply #3 on: February 24, 2015, 12:05:00 PM »
If you up the resistance, you are essentially lowering the current available and they will not be as bright.  Is there a soundboard in the mix, or is this a stunt?

Ill be using a PC 1.6. Thanks for the input and the link to the other led calculator.

Offline QUI-GON JINN

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Re: Green Cree in series
« Reply #4 on: February 24, 2015, 12:34:15 PM »
PC 1.6's do not require resistors for your blade led, the board has a built in current regulator for that. You can adjust the current in the configuration file, or if you have it, RICE. You will only need a resistor for the foc led.
« Last Edit: February 24, 2015, 12:36:03 PM by QUI-GON JINN »


Offline Wickedreamz

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Re: Green Cree in series
« Reply #5 on: February 24, 2015, 05:31:51 PM »
PC 1.6's do not require resistors for your blade led, the board has a built in current regulator for that. You can adjust the current in the configuration file, or if you have it, RICE. You will only need a resistor for the foc led.

Thanks QUI GON. The PC 1.6 im going to use is the one I bought from you awhile back haha

 

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