Hi,
Is your environment model textured? If it is then you could disable lighting on the model which will make it much brighter.
Code:
environment = viz.add('environment.wrl')
environment.disable(viz.LIGHTING)
You could also make the headlight omnidirectional:
Code:
headlight = viz.get(viz.HEAD_LIGHT)
headlight.position(0,0,0,1)
#Double the intensity of the headlight
headlight.intensity(2)
It really depends on what kind of model you have and what kind of textures it has.