I've found the two most important factors in radiosity are 'count' &
'error_bound'.

Try this as your radiosity block:

radiosity{
  // pretrace_start 0.02
  // pretrace_end 0.005
  count 100
  error_bound 0.1
  // nearest_count 10
}

This should be reasonably neat and give you an indication of where things
are heading, but the low error_bound will make things blotchy.  To smooth
it out, you will need to increase 'count' to 300-500, increase
'nearest_count' to 10 and lower the 'pretrace_start' & 'pretrace_end'
values.

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