Can I link long LED strips to motherboard lighting?

[DevilsHand676]

I have a ASUS ROG Strix B450-F Gaming that says it can support up to 5050  RGB LED strips as 3A (12V). But also says it shouldn't go above 3m. My light goes around my desk and is longer than 3m. I don't want to accidently blow the header on my motherboard so is there a way to safely power the strip but still have it linked to other lighting from my motherboard? 

[Enderman]

You can check to see how much current it draws.

How long it is doesn't matter as long as it's less than 3A.

[mariushm]

Each led will go up to around 50-60mA depending on brightness and color (full white will use more power) .. so do the math..10 leds = 0.5A,  20 leds = 1A , 60 leds = 3A etc etc

 

Should be more specific ... each color... red, green, blue typically peaks at around 20mA ... human eyes are more sensitive to red and red leds are more efficient so the peak on red will probably be around 15mA.

So depends on colors displayed by leds ... if two colors are mixed together (ex red and blue to get magenta or whatever) you'll get only 40ish mA per led.

[thrasher_565]

5 hours ago, DevilsHand676 said:

I have a ASUS ROG Strix B450-F Gaming that says it can support up to 5050  RGB LED strips as 3A (12V). But also says it shouldn't go above 3m. My light goes around my desk and is longer than 3m. I don't want to accidently blow the header on my motherboard so is there a way to safely power the strip but still have it linked to other lighting from my motherboard? 

so with rgb it a bit more difficult. if you want more then that 3 amps like mariushm was saying then you need a repeater.

[smaky]

I have recently achieved this goal myself. From one channel of a Corsair Lighting node pro I have 10 strips of 34 5v RGB leds running in 2 parallels of 5 strips, to overcome this current draw hidden in my loop is a second 2 core loop carrying 5V and rated at 3A, this joins the loop at the end of the 2nd strip on each side and effectively allows 8A to be drawn by the rgbs, this also defeats the colour fade towards the end of the runs which can occur from around 2 meters (60 leds) into a run.

 

 Now I know you say you're on the 12V header but the theory is the same, using the correct strips you can boost the voltage buy plugging in more power downstream, and on 12V, every 3 meters is advisable, though you need to remember the signal strength may not be up to great distances so I don't think I would go beyond 10m in a single run using this technique.

 

you could though space the leds out more and use diffuser strips, a lot of work but a lot less stress on your header.

[thrasher_565]

4 hours ago, smaky said:

I have recently achieved this goal myself. From one channel of a Corsair Lighting node pro I have 10 strips of 34 5v RGB leds running in 2 parallels of 5 strips, to overcome this current draw hidden in my loop is a second 2 core loop carrying 5V and rated at 3A, this joins the loop at the end of the 2nd strip on each side and effectively allows 8A to be drawn by the rgbs, this also defeats the colour fade towards the end of the runs which can occur from around 2 meters (60 leds) into a run.

 

 Now I know you say you're on the 12V header but the theory is the same, using the correct strips you can boost the voltage buy plugging in more power downstream, and on 12V, every 3 meters is advisable, though you need to remember the signal strength may not be up to great distances so I don't think I would go beyond 10m in a single run using this technique.

 

you could though space the leds out more and use diffuser strips, a lot of work but a lot less stress on your header.

don't think this works with rgb as there voltages controlled that's why there are repeaters.  you then inject more 12v in too the repeater that has a chip in it like argb and tells the new strip what voltages are to go out.

 

could you provide a schematic of how to inject 12v in the it? or a video?

Edited August 14, 2020 by thrasher_565

[thrasher_565]

this is what i got?

[smaky]

On 8/14/2020 at 9:53 PM, thrasher_565 said:

don't think this works with rgb as there voltages controlled that's why there are repeaters.  you then inject more 12v in too the repeater that has a chip in it like argb and tells the new strip what voltages are to go out.

 

could you provide a schematic of how to inject 12v in the it? or a video?

The power injection I referred to is for the 3 wire type, you simply have a tail coming from the + and - lines on the strip and connect that to a 5V supply, this is connected to in parallel and is used to to hold up the voltage along the run also allowing more current to be drawn preventing discolouring further down the run.

[smaky]

please watch this 

 

 

[thrasher_565]

48 minutes ago, smaky said:

please watch this 

 

 

umm were is the rgb 12v stuff this is all data argb 5v stuff witch is not what we are talking about....