Since a kind soul gave me a couple of Trancefamily SF hats, I used 2 different rolls of neopixels to try different designs. Once seems to be a P5, which are very nice pixels, but fragile, while the others seem to be P!0"

P5, P10, and RayWu flexible P10

does it look better?

sizing up batteries, the P5 do indded use 2x as much power for 2x more pixels

Added some switches and potentiometers to reduce voltage and current to improve runtime

they don't look great when not lit up

better now :)

lot of crap inside ;)

end result

and I can stack them to transport them

will try to carry them that way so I don't smash them and damage the strips that don't love to bend

Demo time:

Or same on youtube:

Of course, as luck would have it, on my very first flight, TSA was "interested" with my hats on their first flight:

And here is the behind the scenes you don't usually get to see. I do not often point out how unreliable LED gear can be, and how easily it can break. Sure enough, the P5 LED strip failed in 3 different places after just 3 days of use. Super disappointing. Thankfully the P10 strip seems to be holding up so far: