alors j'ai fait le tutor récement,  
 
voilà la partie intéressante :
 
Click the Neon Red No Override sample slot to activate it. Then click the Material Type Button (which now says Standard).  
 
The Material/Map Browser appears.  
 
In the Material/Map Browser, highlight Advanced Lighting Override, and then click OK. In the Replace Material dialog that is displayed, make sure to choose Keep Old Material As Sub-Material, and then click OK.  
 
Now the red self-illuminating material is contained within the Override material.  
 
On the Advanced Lighting Override Material rollout, in the Special Effects group, change Luminance Scale from 0.0 to 1000.0.  
 
Now the material will emit light in the scene.  
 
You might notice that the controls in the Override Material Physical Properties group are for adjusting how much light the material reflects and transmits.