When the space key is pressed the light will turn yellow. The colors range from a value of 1 (orangish-red) to 100 (red). Some of the other colors include: 3=orange, 7=yellow, 33=green, 50=teal, 66=blue, 80=purple, 90=magenta.
Numbers larger than 100 loop through the same color range.
To use set light color to, you need a LEGO WeDo 2.0 hub connected (via Bluetooth) to your computer.