Yes, I also have the only seen 15ELA "HillLight" version with up and down angled clear beams, and a very first blue glass 15 that was made in July 1958, when they came on the market. This one was made before certain engineering changes, Also the only one seen. ALL 3 ARE FOR SALE along with most of my museum!
I have a friend who was executive director at many airports (including BWI) who worked his way up through the operational ranks. I asked him about the 15ELA and he recalled having seen it in use in Louisiana.