2010 Christmas post has some interesting history of this great annual event.
We drive Hastings Ranch several times during the Christmas season and I always enjoy it. One of my favorite houses has relatively little in the light category, but shows the old Rudolph the Red Nose Reindeer TV special from the 60's. There is a large screen set up on the front lawn the show plays continually with sound. Seems whenever I drive by there are cars parked in front of the house and sometimes kids sitting on the grass watching the show. The house in on Daveric just south of Alegria.
Of course, when in Hastings Ranch you can also see the lights of the valley below. Upper Hastings Ranch is on a mesa in the foothills of the San Gabriel Mountains and affords some wonderful views.