Get light props

const params = {
  witnesses: witnesses
};
​
client.api.getParentsAndLastBallAndWitnessListUnit(params, function(err, result) {
  console.log(result);
});

{
  parent_units: [
    'OLlkgxuJhX0Ls/G6ElIWF/VhUXOUiHr2xaS0K/pdQmc='
  ],
  last_stable_mc_ball: '6vMXOW9f0dYP5/ZZRV/oevXfCyYvqeDkEIUQr32nNqQ=',
  last_stable_mc_ball_unit: 'aTOhoJOU8i326uEb7WJ0NOUuTkP5GMnpf8E0L7qzRIY=',
  last_stable_mc_ball_mci: 2871211,
  witness_list_unit: 'oj8yEksX9Ubq7lLc+p6F2uyHUuynugeVq4+ikT67X6E='
}