Multi colour led with different mode. 
1) full mode - all the colour
2) white mode - all white
3) colourful mode - all the colour except for white
Take note: each mode can be change by a press of a button. If the switch is on and off, it will change the colour mode.

Each model can be extended. for various fish tank sizes
GX-A200 20-25cm 
GX-A300 30-35cm
GX-A400 40-45cm
GX-A500 50-55cm
GX-A600 60-65cm