My Hoermann garage door opener Supramatic P2 has a 12V G4 lamp. It is a closed halogen reflector lamp including the front glass which nowadays is very difficult to find. Unfortunately, it now got broken.
I designed a replacement using an LED G4 solution I had already at home (Barthelme VisDot 1.5W). It has an aluminum plate with 28.7mm diameter, but basically this adapter could be adjusted also to other sizes.
Now available is also a 22mm holder which fits for Paulmann G4 LED 250lm (28811). Nevertheless, this product is not recommended as it significantly degrades RF remote control functionality.
The holder is printed with transparent PETG.
The author marked this model as their own original creation.