Alexandre Vianna

Hi! What's the best hi quality cinema camera to make "light painting"? I want to get the result similar to the "light painting" made on a 3second (or Bulb) shutter speed on a still photo camera, where the lights of a lantern, or a car light at night, makes a drawing on the scene. I tried to make it with an Alexa Mini, and it doesn't have a "slow shutter speed". Tried on Red, and it doesn't work either. Is there any digital cinema camera that have the shutter speed to make "light painting"? Any suggestions? THANKS. Alex Vianna