# 4.6.1.2.6. eqcorrscan.core.bright_lights._node_loop

`eqcorrscan.core.bright_lights.``_node_loop`(stations, lags, stream, clip_level, i=0, mem_issue=False, instance=0, plot=False)

  Internal function to allow for brightness to be paralleled.

  Parameters: | stations (list) List of stations to use. lags (numpy.ndarray) List of lags where lags[i[:]] are the lags for stations[i]. stream (obspy.core.stream.Stream) Data stream to find the brightness for. clip_level (float) Upper limit for energy as a multiplier to the mean energy. i (int) Index of loop for parallelisation. mem_issue (bool) If True will write to disk rather than storing data in RAM. instance (int) instance for bulk parallelisation, only used if mem_issue=true. plot (bool) Turn plotting on or off, defaults to False.
  Returns: | index
  Return type: | int
  Returns: | network response
  Return type: | numpy.ndarray