> Help me please :/

You might want to look at Hildur Kolbrun Andresdottir's radiosity tutorial.
http://www.simnet.is/hildurka/content/tut1page.htm

Some important things to remember... the ambient setting in normal, non-
radiosity mode mimics ambient light, but in radiosity mode the ambient
setting in the finish of objects is the amount of light emitted. Since
most objects don't emit light, most objects in a radiosity scene should
have ambient 0. An important exception is the sky, which should emit.
The light behind the dresser looks like the ambient is not zero in some
finish near there.

Hildur's recommended settings are:

radiosity {
   brightness 2
   count 100
   error_bound 0.15
   gray_threshold 0.0
   low_error_factor 0.2
   minimum_reuse 0.015
   nearest_count 10
   recursion_limit 5
   adc_bailout 0.01
   max_sample 0.5
   media off
   normal off
   always_sample 1
   pretrace_start 0.08
   pretrace_end 0.01
}

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