Booking Factory Capacity: How Far Ahead a Lamp Order Has to Be Placed

Ask a lamp supplier for lead time and you will get a number of weeks. Ask when the order has to be placed to hit a date and you will often get a shrug. Those are two different questions, and the second one is the one that decides whether your floor set opens with lamps on it. Capacity is not infinite and it is not uniform: a factory that can pour metal bodies all year may have a single paint line, a single plating bath, or a handful of people who can pack a carton to a retail standard. Understanding how a slot is booked is the difference between planning a programme and hoping for one. Our import calendar article maps where the weeks go after the order; this one covers the weeks before it.

Capacity is a calendar, not a number

A production capacity figure answers a question nobody asks: how many units could this factory make in a month if it made nothing else. What a buyer needs to know is what is already on the calendar, and what is still movable. Those are commercial facts rather than engineering ones, which is why they are rarely volunteered and almost never appear on a line sheet.

The practical consequence is that two orders for the same model, placed a fortnight apart, can land months apart. The first fits into a gap between two larger runs; the second arrives after a seasonal peak has filled the line. If your programme has a fixed date — a floor reset, a hotel opening, a container that must sail with a shipping window — the calendar decides the order date, not the other way round.

The three clocks that decide your slot

Once a slot is booked, three separate clocks start, and they do not run at the same speed. The first is components: bodies, shades, harps, sockets, drivers, cords and switches. Some are standard and always in stock; some, like a specific fabric shade or a powder-coat colour, are made to order and can be the longest item on the critical path.

The second clock is finishing. Paint lines, plating baths and shade workshops are usually the bottlenecks in a lamp factory, because they are expensive to duplicate and slow to change over. A black body and a brass body may share every other process and still queue in different places. The third clock is packing: retail cartons, inserts, foam, barcodes and palletisation, which is labour rather than machinery and therefore competes with every other order in the building on the same day. A supplier who quotes one lead time for all three is quoting an average, and averages are exactly what a dated project cannot use.

What a capacity commitment actually looks like

There is a ladder of commitments a buyer can ask for, and each rung costs something different. The useful discipline is to know which rung you are on before you promise a date to your own customer.

How to read the answer you get

A supplier who says “about six weeks” has told you nothing you can plan with. A supplier who says “the paint line is full until the middle of next month, so a slot in the first week after that, with packing in the same week if the cartons are approved by then” has told you everything, including the condition that could break the date.

Listen for conditions. Carton artwork approval, shade fabric availability, and colour confirmation are the three approvals that most often arrive late and push a slot. If those are not named in the supplier's answer, ask directly what has to be approved, and by when, for the slot to hold. That question also tells you whether the supplier is quoting from a production plan or from optimism. Our RFQ checklist lists the fields that turn a quote into a schedule.

Where slots slip, and what to do about it

Slots slip for unglamorous reasons. A plating bath goes down for maintenance. A shade supplier delivers a fabric that is a shade off and the batch is rejected. A larger customer with an annual contract takes priority, which is legitimate and rarely admitted. Chinese New Year, national holidays and peak export seasons compress the calendar in ways that are predictable a year out and invisible three weeks out.

The mitigations are all about structure rather than pressure. Place the order early enough to absorb a slip of a few weeks. Split a large requirement into two shipments so that one slip does not sink the whole programme. Keep a portion of the requirement on US stock so that a delayed factory run fills a gap instead of creating one. And write the recovery behaviour into the order: what happens if the slot moves, who decides, and what the supplier owes you in notification time rather than in apology.

Planning backwards from the date you cannot move

Start with the date that has a consequence: the reset, the opening, the install week. Subtract transit, customs clearance and inland delivery to get the ship date. Subtract packing and production to get the slot. Subtract component lead time to get the component order. Subtract the approval cycle for cartons and colours to get the date your artwork has to be signed. That arithmetic usually produces an uncomfortable answer, which is the point of doing it before the order rather than after.

This is also where a domestic stock position earns its keep. Anrotix holds the range in the United States and dispatches in one business day with delivery in three to seven business days, from ten units with mixed SKUs, so a programme can start selling while a factory run for private label or a custom finish is booked on its own calendar. If you are trying to fit a dated opening into a production calendar, send the date to help@anrotix.cn and we will tell you which of the two routes reaches it.

Frequently asked questions

How far ahead should a lamp order be placed?

It depends on the bottleneck rather than on a standard lead time. Work backwards from your immovable date through transit, clearance, packing and production, then add the approval time for cartons, colours and shade fabric. The resulting date is usually earlier than buyers expect, which is why capacity is worth asking about before the design is finalised.

Does a deposit guarantee a production slot?

Not by itself. A deposit usually supports a slot request, but the commitment only becomes firm when the window is written down with a date and the conditions for holding it. Ask for the window, the conditions and the notification term in writing, and treat a verbal assurance as an enquiry rather than a booking.

Can US stock cover a delayed factory run?

It can cover the gap for standard models in standard finishes, which is why buyers often split a programme between stock and a factory run. Custom finishes, private label packaging and non-standard cartons cannot be covered that way, so those items need the longest planning horizon.