Take some LED strips, cables and an ULN2803 and you get a nice light setup for your Ultimaker (or 3D printer in general). The inputs of the ULN are wired to the PWM outputs 8,9 and 10.
With the normal Marlin firmware you can control the PWM value with the M42 command.
M42 P8 S255
This sets the output 8 to full power. That’s all!