So I've gotten to thinking. what if. instead of dedicating a single light source type as security lighting, why not have automated alternation between one, two or even three?
I'm thinking in my future property that I can mount a Low Pressure Sodium fixture, a Mercury vapor fixture and a High pressure sodium fixture all on the same pole and have some sort of automated time switch choose between 1 of the three to light each night and cycle through to spice things up a bit. Of course it'd also have a manual override.. So if i really wanted I could switch on fixtures at will (all at once

).
My thinking is that it will drastically improve lamp life since all lamps will only be running 121 days of the year and if that is 8 hours each night that would only log 968 hours on each lamp per year (give or take)
So not only will lighting be interesting at night i would not burn through the stock pile as fast and I could improve the likely hood of my lighting systems surviving into old age..