====== ReadLightSensor ======

The **ReadLightSensor** function reads the intensity of the light currently being 'seen' by the NXT light sensor.

The **input** parameter should be an NXT input port number between 1 and 4 (which the light sensor is plugged into).

The **active** parameter should be set to **true** if you want the white light to be turned on during sensing and **false** if the light is not required.

The returned value will be a light level value between 0 and 100.
<code>level = nxt.ReadLightSensor( input, active );</code>

====Example - Sense light level on port 3====
<code javascript>
function OnStart()
{
  nxt = app.CreateNxt();
  app.SetMenu( "Connect,Light Level" );
}

function OnMenu( name )
{
  if( name=="Connect" )
    nxt.ShowDevices();

  else if( name=="Light Level" )
  {
    level = nxt.ReadLightSensor( 3, false );
    app.ShowPopup( level );
  }
}
</code>