[Edit] ok here is the solution for the white spots:
The problem come from the photometric light as plane. The specular IS the problem.
- turn off specular on those lights
- create Omni lights for only the specular, and align to the photometric lights.
- adjust intensity, color as you want. That's it!
thanks for djulio74 on the french 3d-Station forum.
and the result:
Mental Ray and materials test. I used 3 photometric lights (plane) with mr-photograph exposure. There is 2 pass (beauty+occlusion) + z-pass (for the lens-blur effect) combined in Photoshop. Knows someone how I get out the white spots on the metal and glass shader?