This is a Test lamp for one ore there pahase. Simply just 2 230V e14 light bulb in serial connection. 230V half light 400V full light. Use 8 5mm M3 allen bolts and M3 melt in nuts for the assembly. Fusion 360 cad file included. For the top use some transparent material, ore resin printer just like me.

E14 socket:

https://www.aliexpress.com/item/1005003667528505.html?spm=a2g0o.productlist.main.37.1b135557F7x4Rc&algo_pvid=c005c3d6-741e-478d-8d9d-5486e9823b7e&algo_exp_id=c005c3d6-741e-478d-8d9d-5486e9823b7e-18&pdp_npi=4%40dis%21HUF%212441.96%211659.19%21%21%216.52%21%21%40210318b816955413074734677e85af%2112000026717592541%21sea%21HU%212377267559%21&curPageLogUid=bCKA05xklARi

Test cable:

https://www.aliexpress.com/item/1005005672267088.html?spm=a2g0o.productlist.main.5.617f2102qswZ9O&algo_pvid=5a1e6e84-5bea-4025-8b16-a8a3635dba0f&algo_exp_id=5a1e6e84-5bea-4025-8b16-a8a3635dba0f-2&pdp_npi=4%40dis%21HUF%211074.91%21966.3%21%21%212.87%21%21%402101fd4b16955414019662943e663e%2112000033968207168%21sea%21HU%212377267559%21&curPageLogUid=D1kNoLb8cICM