node = hou.pwd()
geo = node.geometry()
def fetchIfObject (passedName):
    # Return a named item if it exists.
    try:
        result = hou.node(passedName)
        if result == 0:
            result = None
    except:
        result = None
    return result
    
parent_name = "light_container"   # Name of master object that will hold all the generated lights.
subnet_name = "/obj/%s" % parent_name
        
parent = fetchIfObject(subnet_name)
if parent == None:
    # Create a SubNet for all lights to reside under.
    parent = hou.node('/obj').createNode('subnet', parent_name)
    
for (i,point) in enumerate(geo.points()):
    light_name = "ilight_%s" % i
    ob = fetchIfObject('/obj/%s/%s' % (parent_name, light_name))
    if ob == None:
        # Light does not exist, time to create it.
        ob = parent.createNode('hlight', light_name, run_init_scripts=False)
        ob.parm("light_type").set(0)        # Set the type of light.
        ob.parm("coneenable").set(1)        # Turn on the spotlight cone to convert this point light to a spotlight.
        ob.parm("light_colorr").set(1)      # Set light color.
        ob.parm("light_colorg").set(0.75)
        ob.parm("light_colorb").set(0.8)
        ob.parm("light_intensity").set(1.0) # Set light intensity.
        
    # Set the position for this light.
    p = point.position()
    ob.parm('tx').set(p[0])         # Position the item.
    ob.parm('ty').set(p[1])         # Position the item.
    ob.parm('tz').set(p[2])         # Position the item.
    
    # Rotate the spotlight so it is facing down.
    ob.parm("rx").set(-90)