Injection from same PSU Long Run

Ive been using the calcuator at Spiker ( thanks to whomever shared it first here ). In the injection examples on there site there using different PSU for injection into each section.

I assume if i single PSU rated at enough amps i can just inject as and where is needed ?
Also keeping the postive line continuous ?


Something like this :

Finally my LEDS will be closer than one inch as using 60led / meter tape does this matter ? 1 Inch distance seems very far.

Please be gentle just getting into this :slight_smile: Thanks !

Hey @flashy!

Looks like you’ve got a handle of stuff pretty well!

Your power injection calculations for 60/m will be better than 1 inch, so if you use their 1inch setting it just ends up being conservative for you. @wizard might know the equivalent wire gauge to use when considering most common strips (how much copper is in a flex trace?)

My rule of thumb has always been to inject 5V 60/m strips every 4 meters (every 240 pixels).

Correct on the power supply - with a single power supply, you can keep the positive lines connected through the run and inject power whoever you need.

Good luck!

Thanks for taking the time to reply :pray:t2:

I realise now also i will have to use 5V LEDS as 12v dont seem to be addressable down to the individual led lots to learn !

Actually there’s a few different individually addressable chipsets that use 12V for the LEDs. Then you need to provide the Pixelblaze with about 300mA of 5V via a separate power supply or buck converter.

I’ve recently been a big fan of the GS8208. WS2811s are cheap and come in a lot form factors like strings/strands. WS2815s are also popular for strips.


Ive done some google and online pretty easy to find comparions of gs8208 vs ws2815

But not much comparing WS2811 to anything. All i can really work out about WS2811 is its got high power draw when no leds are lit, its cheap, its only got 3 wires so more likely to fail.

@jeff any downsides of WS2811 im missing ?

I think you got the main differences.

All the 12V WS2811 I’ve seen use a small external IC. This can be on a small board soldered to a through-hole LED to create a “bullet”, on a small
PCB to make a puck/module, or surface mounted on a flex strip. My only experience with them has been when I want a non-strip 12V form factor, but now people are manufacturing GS8208 (actually an 8206 external IC) bullets as well. The brightness curve is so much better, I’m probably never going back.

Compared to the WS2815, WS2811s use about 50% more power (according to QuinLED tables) How much power do addressable LEDs use? -
for full brightness white but I don’t remember them being perceptibly much brighter than my WS2815s.

Like you noted, the WS2815 and GS8208s both have a backup data path that the 2811 does not. I guess it’s kinda hard to know how often that has ever saved the day.

For the best looking patterns where you can definitely see the difference, there’s still no beating the 5V SK9822a on an engine that can handle it, like Pixelblaze. Better gamma, more reliable long runs, faster data and frame rates.

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Thanks for the Quinled link i had not seen that before, i think ill go WS2815.

for anyone else ready this was a good video / doc with some stats :


Also for those interested BTF say the WS2815 is being discontinued and new model to replace is in Beta testing. Found this out as WS2815 is mostly of stock in their store apart from ECO variant.