[Lab] Lab Digest, Vol 55, Issue 32

[Adrian Jones]

I've used lots of these strips though not from BestLightingBuy... too
expensive / meter. 
The top is Gnd (-), the bottom is power (+) and the data path follows the
arrows (i.e. LED[0] is first one at the start of the arrow (leftmost in your
picture)
On the strips of waterproof ones from China, the Data In pin is actually
called "DO" and the Data Out to the next stage is "DI"... go figure!

... Adrian the Canadian