if lightType in ('sun', 'distant', 'spot'):
  wm = light.WorldMatrix()
  pto = (0, 0, -1)
  pto = dotp(pto, mcol(wm, 0)), dotp(pto, mcol(wm, 1)), dotp(pto, mcol(wm, 2))
  if lightType == 'distant':
   point_from = mul3(pto, [-1, -1, -1])
   lux.point._from = xfm(point_from)
   lux.point.to = [0,0,0]
  elif lightType == 'sun':
   lux.vector.sundir = xfm(mul3(pto, [-1, -1, -1]))
  else:
   pto = add3(pto, wm[3])
   lux.point._from = xfm(point_from)
   lux.point.to = xfm(pto)

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)