I am looking for information on integrated bookcase lighting, but only have limited pictures of what I'm looking for. I included links to web pictures below. They are in the office of French author Edmonde Charles Roux, and she has since passed away. I do not know where this office is located nor if this setup still exists (or who occupies the office now).

Here's what I know about this setup :
- it is integrated into the shelf, and lights both upwards and downwards ;
- it is incandescent, and if one lamp burns out, the others stay lit ;
- as far as I can see, there are no plastic or glass covers either above or below ;
- the shelves are not adjustable ;
- there appears to be a wedge-shaped reflector/diffuser into the slot at the front of the shelves ;
- the pictures were taken in France.

Here's what I don't know :
- lamp type. I suspect they might be double ended festoon, but not sure ;
- lamp wattage/brightness ;
- manufacturer ;
- date of manufacture.

I should add that I never saw them in real life.

https://www.radiofrance.fr/s3/cruiser-production/2016/07/9fe012d9-257a-4f8c-9caa-9094bf3d01c5/1200x680_edmondecharlesrouxmodif.jpg
https://img.lemde.fr/2016/01/21/0/20/2808/1872/1440/960/60/0/a9bebe1_19572-1abtejj.jpg
https://www.francetvinfo.fr/pictures/uLbnR_5c4sKkBzyawvAAP-tiAPQ/1200x900/2016/01/21/phpfnBh07_1.jpg
https://www.come-back.be/sites/default/files/roux1.jpg

Many thanks to everyone who can provide insight on this topic !

looked at a mid 50s "MCM" home in my area that had a "library" and had that type of lighting
incandescent lights imagine "display case" style long tubes
the house was designed by an architect and very "frank lloyd wright" inspired and massively under priced
ERA 1950s

That would have been nice to see !

These ones in the pictures I linked have individual lamps instead of tubular incandescent (Lumiline or equivalent). I'm guessing they have some kind of festoon lamps.

the house was a tri level side split home and main living space was on the single level side with vaulted ceilings with the kitchen on one end and the "library" on the other and the shelving ran along 2 walls L shaped and there was a desk in the middle of the room and the shelves were behind the user of the desk and would be head height sitting in a chair with built in credenza lower everything was in matching wood
the house was original in furnishing (appeared to be) and was Danish in design