Picked up for a tiny donation, these lighting sets are being stashed away in case I need to restore something, rather than for serious use on a modern layout.
Each one contains a length of wire, and four small lightbulbs and screw-in holders. Without opening a set, the falament bulbs globes appear to be 6mm diameter. If you fancy adding a shade, there is a pattern printed on the card.
JNT Products are another new company to me. I can find JNT Model Products, who were incorporated in 1970, about the right time, looking at the packing. They have since been disolved so no more.
Nowadays, we'd use LEDs for lighting a model. They last forever, use tiny amounts of current and generate no heat. Since you aren't likely to need to change them, lights can be built into buildings etc.
At Pendon, because the Vale scene started life so long ago, the builders incorporate light tubes (coridors made to cardboard to duct the light around) into their models so the bulbs can remain below the baseboard for changing and to keep the heat away from the cardboard structure.
Many people arge that everything old is better than anything new, but I'm afraid swapping filament bulbs for LEDs is definitly an improvment!