Matt,
The only photos that I see in Folke's book appear to be more current photos.......hope that he includes more photos in a revised/updated 2nd-addition to his book.
Bergflak has a few photos of these light-sets......if memory serves me well, I believe they are from period books/manuals.
The light-sets (as the title says) are a "night-use" item.......the only photos may very well be of "training units" very early in WWII or per-War photos.....I don't believe that a Camera-Man would be out there in Combat (at night) taking photos of these (?).
..."but" without a "period-photo" does not mean that the complete sets were not made nor issued.
I will post a good photo of a more complete Light-Set at the end of this posting.
Period and/or Combat photos may not exhist. I would believe that Light-Sets would be removed and packed away in whatever they were carried in so that the unit would be more able to move quickly if required....same as todays US Army units.
If you look on page 342 of Folke's book shows the MG34 Gun-Crew at rest (posed photo)....the "Gunner" is wearing the optics-Carry-Can.....and if you look just to the left of it, there appears to be a pouch on his front/side. This is very similar to the case that I received with a WWII marked MG34/42 complete Light-Set. It was "cme" stamped on the rear of the case and had enough room for all of the light-cords, and a wooden-tray under the flap for spare light-bulbs. But again, you/we may never locate/see a period photo of a complete light-set laid out for viewing.
Common logic would say that anywhere there was a light used, there should be an off/on switch......"and" we all know how long a "gunner" would last if he remove the light while plugged in / "ON" in a Combat-Zone/the "Front" if he tried to see the Azmuth-counter to insure he was on Zero/Direct-Fire......or to ajust his scope at night (in darkness) for an indirect fire-mission for an area target with the MG34 or MG42. "BANG"....next "gunner" up, please......
....and again, we may never see a period photo of these due to any number of reasons........"and" even if we do see one, it may not be of a complete light-set because given the nature of "Infantry".....a soldier will only carry what is absolutly necessary to operate, a lot of items/equipment was left in the rear with "supply" or got "lost" during operations.
I have provided a photo of a more complete light-set below for your viewing.
Regards, RichardS in MI.
US Army, Retired
Blanksguy2001@chartermi.net