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Replacing Fan LED's

post #1 of 6
Thread Starter 
I want to replace my current (red) on the HAF 922 to a blue color, my biggest concern is the "Ma" rating on the bulbs, so when i go to the store i can get the right ones.

Does anyone know what kind of bulbs are best suited for these types of fans (200mm) i was thinking 20ma but that might not be that bright, not sure if going more will not work.

Thanks
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post #2 of 6
bulbs? It uses 5V LED's at least best to my knowledge not sure if my knowledge is just lacking on the term of bulb and 20MA, all i know linked to bulbs are the Lumin's released and angle of which the light is output from the source.

But replacing the LED's isn't too bad they pop out rather easy, note the positive/negative side, snip high as possible on that LED, then add new LED via solder.

Though not sure if I burned something out on the one I did, since it worked for about 3 months then all 4 LED's stopped working at once, so must have burned out some chip regulating it.
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post #3 of 6
Most, if not all fans are rated for 12v+

You can put fans on 5v+ and 3.3v+ and the LED's will be dimmer

Go for the 12v+ led's.

They are about $1 on ebay, so don't be afraid to experiment.

Use an old PSU that you don't care about to test them if you want to be safe.

Make sure you get the right size too.
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post #4 of 6
Thread Starter 
dont have an old PSU just an expensive one lol, what should i do, install em and go for it?
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post #5 of 6
Don't worry about the current (mA) so much - most LEDs are rated for about 20mA. You should be more concerned with the voltage drop across them. Red LEDs generally have a 2.0V drop and blue LEDs generally have a 3.4V drop. Take a multimeter and measure the voltage across the red LED leads to test it. Likely, it means that you can't just swap a red LED for a blue LED.

Now, from my testing of Antec TriCool fans, they actually use a constant current source to power the LEDs. That means without an LED (open circuit), you measure 12V across the wires. Then, regardless of the load you put on, you will always see 15-20mA. This means that you can put any LED in there, so long as it can handle 20mA. So, if you want to see if you can actually swap for a different color, clip an LED out, and measure the voltage across the wires where the LED used to be. If it's higher than 3.4V, then you can likely put in a blue LED.

See my post on swapping LEDs: [How To] Case Fan LED Swap
post #6 of 6
Quote:
Originally Posted by sgmustadio View Post
Don't worry about the current (mA) so much - most LEDs are rated for about 20mA. You should be more concerned with the voltage drop across them. Red LEDs generally have a 2.0V drop and blue LEDs generally have a 3.4V drop. Take a multimeter and measure the voltage across the red LED leads to test it. Likely, it means that you can't just swap a red LED for a blue LED.

Now, from my testing of Antec TriCool fans, they actually use a constant current source to power the LEDs. That means without an LED (open circuit), you measure 12V across the wires. Then, regardless of the load you put on, you will always see 15-20mA. This means that you can put any LED in there, so long as it can handle 20mA. So, if you want to see if you can actually swap for a different color, clip an LED out, and measure the voltage across the wires where the LED used to be. If it's higher than 3.4V, then you can likely put in a blue LED.

See my post on swapping LEDs: [How To] Case Fan LED Swap
Just for a note on that, I swapped Red LED's for Blue LED's on the same fan he was trying to use.

As I said, every single LED turned off at once, fan still works, so it must have fried something. So be cautious.
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