These 30W LED floodlights are a popular lighting choice for Space Battle themed displays. These boxes wrap around them and make them space-like!
Sized for these: https://a.co/d/aPs0P87

• They do fit on a 256mm bed, but just barely -- be prepared to carefully orient and go edge to edge!
• The one labeled "warning" has diagonal stripes in the top of the model, great for a black/yellow danger type look
• The lights do get warm, so PETG / ASA / etc... is probably a good idea.