Lighting Housing Lead Times: Sampling, Tooling and Production
Lead time is the question buyers ask most and the one most often answered badly, because a single number hides three separate clocks. Ask which clock is running and the answer becomes useful.
Three clocks, not one
| Clock | What runs it | Typical duration |
|---|---|---|
| Sampling | First articles from a drawing, or a first-off from new tooling | About 15 days from drawing approval |
| Tooling | Mould making and first-article approval, only for new geometry | Around 15 to 20 days, ahead of production |
| Production | Existing series after deposit; new projects after sample sign-off | 15–25 days for existing series; 30–45 days after sample approval on new tooling |
Read together, these explain why two projects that both say “about a month” can finish eight weeks apart. One is a repeat order on an existing body; the other is a new casting that has to be tooled, sampled and approved first.
Drawing approval is the clock start
Nothing meaningful runs before the drawing is approved, because sampling against a drawing that is still moving produces a sample that will be redundant. This is also the step where the most time is lost — not in production, but in the interval between a supplier asking a good question about a tolerance and receiving an answer.
A drawing with a revision number and toleranced critical callouts compresses this stage more than any supplier-side improvement can.
Why we quote dates rather than promise them
A date given in conversation is worth very little, because nothing records the basis on which it was given. What a buyer can actually hold a supplier to is a date stated in the quotation against a specified scope. So the answer to “how long?” is properly: the dates are confirmed in the quotation for each project — and then they are in writing.
The buyer-side delays that cost more than production
- A late answer on a tolerance. Two days lost here is two days lost, and it happens at the start when the whole schedule is still movable.
- Artwork arriving after the goods are made. Printed labels and retail cartons are a separate process step and cannot be compressed into the last week.
- A specification change after sampling. It resets the sample clock, not just the production clock.
- Certification documents requested at the port. Paperwork is prepared with the shipment; asking for it after loading turns a routine order into a rushed one.
Where stock changes the answer
For common surface-mounted body sizes in the 3″, 4″ and 6″ range, bodies are held in stock, so a top-up does not wait for a production run. That is not a universal answer — it applies to those sizes and not to a custom casting — but for buyers running a repeat programme it removes the sharpest edge from lead-time planning.
Frequently asked questions
What is the lead time for lighting housing orders?
For existing housing series, production typically runs 15–25 days after deposit. For new tooling projects, sampling is about 15 days after drawing approval and mass production runs 30–45 days after sample approval. Exact dates are confirmed in the quotation for each project.
How long does first sampling take?
First samples from an approved drawing typically take about 15 days. Production is not released until the sample has been signed off.
Why is a lead time not given as a single number?
Because three separate clocks run — sampling, tooling and production — and they differ by whether a part is an existing series or new geometry. Two projects described as 'about a month' can finish eight weeks apart.
Related reading: the four inspection checkpoints, stocked housing ranges.