Budget 18–30 days from deposit to container sailing. The breakdown: production runs 15–25 days for standard products, a bit longer if there's custom tooling or packaging (add 7–15 days). Quality inspection takes 2–3 days at end of production — schedule it for when production is 100% complete and at least 80% packed. Container loading is one day. Export customs clearance is typically 1–2 days in Xiamen. So the portable number is about three to four weeks from deposit to "your goods are on the water."
The variables that stretch this: Chinese New Year (mid-January to mid-February — the whole manufacturing ecosystem shuts down for 2–3 weeks, and the weeks before are a rush that may push your order back), component shortages (Meanwell drivers in particular can hit supply crunches), and last-minute specification changes after production has started. Lock your spec before you send the deposit.
A 40ft container holds roughly 4,500–5,500 LED panel lights (60×60 cm) or about 1,800–2,200 UFO high bays, depending on packaging.