Bill Dellinges' Superstition Mountain Mystery Light. From Bill's account:

I first saw the light on the mountain in December of 2004. It was about 1:10 p.m. It was a very bright point source of light, about as bright as you might expect the planet Venus to be at dusk-you couldn’t miss it if you were looking that way. The light shone for about 20 minutes then began to fade away. It appeared each day at about the same time shining from an area of Hoo-Doos (large finger-like rocks) just east of Flatiron as seen from our home near 16th Avenue and Geronimo. I invited several neighbors over to witness the sight. The timing advanced by about a minute per day, which indicated to me that it was very likely a case of the sun reflecting off some shiny object. But what was the object? A piece of glass? A Lost Canteen? A light colored rock? I took notes each day until the phenomenon stopped in early January ending the “light show.”
Apparently, between about December 5th and January 5th, the sun is in just the right position to make this apparition possible as seen from our home. I was ready the following year (2005) to see if it repeated itself. Sure enough, around December 5th, there it was again, shining again for 20 minutes each day. My curiosity was killing me; what the heck could be up there causing this reflection?!
I knew what had to be done. I had to go up there and see for myself what was causing the “mystery light.” This would not be easy, as I’d have to take on the grueling Siphon Draw Trail. In preparation, I used a strong telescope to diagram the area near the light as I noted rock formations and bushes. On January 5th, 2006, after a five hour climb, I arrived at Flatiron. Using my drawing as a guide, I made my way to where I thought the light’s source should be. Standing at the base of a huge Hoo-Doo, I could see there was something stuck on a vertical slab of rock about 30 feet above me. But the Hoo-Doo was too steep and smooth. This was as close as I’d be able to get to the object. Someone had gone to great lengths to put this thing where no one could reach it without climbing apparatus. Putting my binoculars on it revealed a plaque about the size of a 12”x12” picture frame glued to the cliff. On it were the initials “E.T.B.” A small ledge prevented me from seeing its lower half which may have had additional information. My point and shoot camera was inadequate to record the object from where I was standing, but I did take a picture of the general area.
So this was causing the bright light I’d seen some 3 miles from my home; amazing, considering the plaque was very dark. Apparently a memorial had been placed there by someone - but when and for whom? Sharing my findings with rangers and a couple of mountain experts, all where unable to shed any light on who may have been responsible for placing the plaque there, or whom it may have memorialized. So solving one mystery has created another!
Bill Dellinges, Apache Junction, AZ.