Interior lights for trailer bodies and lorry cabs, mostly LED.
Interior lighting matters where loading happens in the dark, in a closed box trailer or a horse trailer.
How to choose
Check the diameter or the outside measurements against the opening you are fitting into, and the mounting, whether the lamp is surface mounted or recessed. Voltage matters as well, since a lorry runs 24 V where a trailer runs 12 V.
Interior lighting
For lighting on the outside of the trailer, see work lights and trailer lighting.
The largest makes in this category are Fristom with 13 of the 14 parts here.