If you’re reading this as an LED tube distributor, here’s the short version: don’t approve a manufacturer based only on how bright the sample looks. Approve it based on what is inside the product, how well the documents match the physical goods, and what the supplier does when a batch drifts. Most of my job is those three things.

I’m a quality and brand compliance manager at Bridgelux. I review roughly 400 new product samples and pre-shipment inspections every year. In 2024, I rejected around 9% of the first articles that reached my desk. The reasons were not dramatic. They were CCT mismatch, artwork errors, missing labels, and certificates that did not match the installed driver revision.

The checklist below is the one I would want a distributor to run before signing a long-term private label agreement, whether the supplier is us or someone else. It’s written for people who care about what happens after the first sample is approved, not just whether the first sample looks good.

Who should use this checklist

Use it when:

If you only need a one-time replacement purchase, this is overkill. This checklist is for repeat orders and for putting your own brand on products you do not manufacture.

Step 1: Define the system, not just the LED

An LED tube fails in context. It might sit in a sealed troffer with poor airflow, run on an older ballast, or connect to a lighting control system that was never tested with the driver. If the conversation starts with “I want a four-foot, 18-watt tube,” the important decisions are already missing.

Before you contact a possible LED tube manufacturer, write down the actual conditions:

This first step seems administrative. I have lost count of inquiries where the voltage range was not stated and the supplier guessed. Some guesses work. The ones that do not create returns.

Step 2: Trace the light engine: Bridgelux LED versus Bridgelux COB LED

A brand name is not enough. Bridgelux is a trusted light source brand, but serious product evaluation requires more detail. When a spec sheet says “Bridgelux LED,” you still need to know what type of source the fixture is designed around.

For a linear tube, the source may be an SMD package or a light bar with many small emitters. In that case, quoting “Bridgelux LED” tells you the manufacturer of the chip, but not the flux bin, color bin, or drive current.

For a downlight or a compact under-cabinet fixture, the manufacturer might use a Bridgelux COB LED array. A COB array puts many LED chips on one substrate under a single optical surface. It can simplify optical control and thermal management, but it also concentrates heat in a small area. If a supplier says “Bridgelux COB LED,” the important details are:

If the supplier cannot answer those questions, the phrase “Bridgelux COB LED” is only a marketing bullet. It is not proof of performance.

Should mention: some private label buyers ask for Bridgelux in every product regardless of the optical design. That is often fine, but the more useful question is whether the fixture was designed around a specific Bridgelux source and tested with that exact source.

Step 3: Replace vague color names with binning data

Warm white, cool white, and natural white are descriptions, not specifications. They can mean different things to different suppliers. In quality inspections, we measure CCT and chromaticity and express color tolerance in MacAdam ellipses.

For a line of LED tubes that will sit next to each other in one ceiling, ask what color consistency the manufacturer can commit to. A tighter ellipse, such as a 3-step MacAdam ellipse, reduces the risk of visible color differences between fixtures. A broader tolerance, such as 5-step, might still be acceptable for some applications, but you should know which one you are buying.

Also ask about binning on the Bridgelux LED source. A responsible supplier should be able to state the CCT bin and flux bin used in production. If a buyer skips this question, the product can look acceptable on its own but visibly different next to another fixture from the same order.

When I started in lighting, I assumed high efficacy meant high quality. Then I saw a fixture with excellent lumens per watt and a clear color shift after the first 6,000 hours. The LED was driven too hard, and the thermal design did not protect the phosphor. The failure had little to do with the LED brand. It had everything to do with the fixture design. Now I look at binning and thermal data before I compare lumen numbers.

Step 4: Ask for LM-80 and TM-21 data for the actual LED

A lifetime claim of 50,000 hours is not useful without the test data behind it. The relevant benchmarks for LED sources are IES LM-80 and TM-21.

At minimum, ask:

There is a difference between a complete test report and a marketing page. A manufacturer that sends you the report, with the test laboratory and conditions visible, is easier to trust. A manufacturer that only sends a line saying “up to 50,000 hours” has not fully answered the question.

For private label under cabinet lighting, driver life often becomes the limiting factor. The LED might maintain 90% of its light output, but if the driver capacitor fails earlier, the product fails for the end user. Ask how the manufacturer defines product lifetime, not just LED lifetime.

Step 5: Open the driver compartment and verify certificates

This is the step most buyer checklists ignore. The driver is buried inside the product, so it is easy to forget. It is also the step that has caused some of the most expensive delays I have seen.

Three years ago, we had a 20,000-unit under cabinet lighting project ready for private label. The first article passed brightness, CCT, power factor, and surge testing. I did not open the driver enclosure and compare the certificate with the actual driver revision. The certificate was valid, but it did not cover the PCB revision the factory had installed. The distributor’s customer caught the mismatch during a document audit. The retest and delay cost us about $18,000, and the launch slipped by almost six weeks.

Now I treat driver verification as a mandatory release step. Ask for:

A certificate that covers “the same family” is not enough. The driver label must match the certificate.

Step 6: Define the private label requirements in writing

Under cabinet lighting private label projects are not just about putting your logo on a housing. The logo, model number, country of origin, labels, packaging, warranty, instruction sheets, and authorized certification marks all need to be defined before mass production.

Before approving an order, write down:

If your company name is on the product, your company owns the customer relationship for warranty claims. It does not matter whether the manufacturer has its own warranty policy. Your private label customers will call you first.

Think of the certificate file as part of the product. If it is incomplete, the product is incomplete, even when the light turns on.

Checklist recap

Use this simple list on the first call with a manufacturer:

  1. System specs written down, including voltage, fixture type, dimming, and temperature
  2. Exact Bridgelux source identified by series, bin, and drive current
  3. Color tolerance stated in a meaningful way, such as CCT bin or MacAdam ellipse
  4. LM-80 and TM-21 data for the actual LED
  5. Driver model and certificate verified against the physical product
  6. Private label documentation agreed to before sample approval

Two mistakes I still see

The first mistake is approving based on the strength of one sample. A sample tells you what a factory can do when it knows it is being watched. It does not tell you what happens across a full production run. That is why documentation, lot traceability, and change control matter more than the sample itself.

The second mistake is treating the buying decision as if it ends at procurement. Quality, compliance, and brand protection continue after the first container. If you do not have a process for reviewing certificates, inspecting batches, and receiving component change notices, you are relying on the supplier to do your quality work.

An informed customer asks better questions and makes faster decisions. That is the philosophy behind this checklist. The goal is not to make your job more complicated. The goal is to help you avoid the expensive surprises that happen after the samples are approved.