Nusbio using the 'APA 102 adapter extension' to control up 2 strips. Each strip has 10 LED powered from the USB.
The 'APA 102 adapter extension'.
The first things to know about RGB LED strip is that here are multiples standards.
The 2 most popular are:
APA 102 also called DotStar which uses an SPI like protocol for communication is supported by Nusbio.
WS2812 with a b or not, also called NeoPixel will be supported via an extension coming in 2016.
The WS2812 standard requires a feature called PWM (Pulse With Modulation) generally supported
You can power more LEDs by plugging an external 5 volt 2 or 4 amps power adapter into the extension.