> actually there is no light in the scene at all.

So it's radiosity, then? Then that's your problem: Radiosity uses a 
random distribution of rays for lighting, which changes for every frame, 
therby creating the flicker. You could try to use very high quality 
settings for you radiosity, or fake the radiosity. Eli aka Apache did 
something like that once, see

	http://imp.org/forums/topic.asp?TOPIC_ID=289

Not sure if that works with you're scene, as you're relying on the 
radiosity to emit those tubes light, right?


HTH,
Florian

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