Multi-section spectral lamp LK-3 for several chemical elements disassembled metal base.
Have heating wire inside and when its heated - neon gas is glowing in the vector of this heating. Maybe also some radiation can be if make heating + high voltage to "anodes". I just tested with flat Tesla coil and arc Tesla coil.
This lamp is similar to the TDS-43 lamp, but there are no longer 4 tiers, but only 2. Each tier contains 2 elements.
By the way, the cathode is also bare, not hidden in the cathode screen.
An interesting feature of the lamp is the electrodes in which the elements of the emitted lines are located - “a sort of “whatnot”. This time it consists of 2 tiers, each tier consists of two ceramic plates paired with each other with elements for emitting spectral lines.
Elements: Mo(Molybdenum), W(Tungsten), Cr(Chromium), V(Vanadium)
Buffer: Neon.
May use for art, DIY, or by its first purpose.