Exodus 37.23 mentions what we have noted elsewhere (Exodus 25.37),

“And he made its seven lamps, its wick-trimmers, and its trays of pure gold” (Exodus 37.23).

The Lord wanted a source of light inside the Tabernacle, and He specified what He wanted, and Exodus 37 shows that Bezalel made what God wanted, a single lampstand with seven lamps on it, three two sides, and one in the middle.

It would be the complete light source in the Tabernacle, and seven lamps shows that magnificent truth.