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I'm using 5 of those 8mm NeoPixels + a 5V Trinket.

I'm trying to get a rough estimate of the current requirements that would have, assuming all 5 NeoPixels were running at full brightness "white" (255 RGB).

I'm voltage-regulated to about 150 mA from the Trinket and my current hunch is that those NeoPixels need more than that, but trying to confirm it.

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According to the data sheet each LED takes a maximum of 3*20mA, so you are pulling 300mA. You are going to need a bigger power supply :(

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