These bulbs and caps just ended on ebay and brought a good price. I have no idea what they (the caps) were originally used for - insulators, light diffusers or what?
Both have the same patent date (7/11/05), but two different manufacturers (Betts & Betts, Solar Elect).
Can anyone on this forum shed some light (no pun intended) on the use and intent of these caps? Thank you in advance.
See two photos with the following link:https://www.dropbox.com/sh/ejb4n9c9nbrhwj5/AAD_NhVA2gIOafYTi3AplgFya?dl=0