Ko hono fola ʻo e maama ʻo e ngaahi meʻa ʻoku ne fakaʻauha ʻa e mama

There’s no one-size-fits-all standard for this question.

ʻI he angamahení, ʻi ha fale ngaohiʻanga ʻoku maʻolunga hono mita ʻe tolu, mama hono naunau ʻi lalo 40W ʻoku meimei ke ʻi ai ha mita ʻe ua ki he tolu. Ki he ngaahi feituʻu ʻoku fuʻu lahi ai e mita ʻe tolu ʻi he maʻolunga, 50-70ʻOku fie maʻu ʻa e hono naunau, fokotuʻu ʻi ha vahaʻataimi ʻo e mita ʻe fa. Neongo ia, the specific needs depend on your requirements for lighting efficiency.