In the circuit diagram, only the name of the lamp has changed.

I have removed the glass bulb of the Narva 12V / 50W bulb from the bayonet base and the halogen-ceramic plug-in (size G4) with a two-component glue fixed in the bayonet mount.

Instead of the 12V 50W bulb is now a 12V 20W halogen glow lamp. It has been shown to grasp for a better illumination of the image to a halogen bulb with matt bulb surface.

The use of an LED as an illuminant brings a better result.