Go to >advanced settings in the colour >Illumination > bump up Luminous Intensity
I never managed this, but you can cheat a little bit with Appearances/Lights/LED.
This will give you a bright white color.
This all has to do with the type of scene used, materials and intensity of the lighting.
Remember that a part should not be white completely otherwise you wont see the shape..everything needs a bit of shading to see the depth.
you have two options to do this. Check my screenshot.