I approve roughly 200 lighting specs a year across commercial projects. In Q1 2024 alone, I rejected 12% of first-delivery samples due to specification mismatches—things that could've been caught on paper before anything shipped.
This checklist is for anyone who specifies, orders, or approves lighting for commercial or hospitality spaces. It's the seven-point review I run before signing off on any order, especially when working with design-driven brands like Louis Poulsen where the margin for error is slim and the cost of getting it wrong is high.
Skip to the checklist:
- Verify the exact product code and finish
- Confirm the beam angle and distribution
- Cross-check the color temperature across the entire order
- Double-check the dimming compatibility with the control system
- Check the physical dimensions against the ceiling plan
- Validate the IP rating against the room classification
- Review the warranty terms and replacement parts availability
Let me walk through each one, why it matters, and where I've seen things go sideways.
1. Verify the exact product code and finish
This sounds so basic I almost didn't include it. But here's the thing—I've seen orders for a Louis Poulsen PH 5 that were supposed to be the pendant version, and someone ordered the wall mount. Same product family. Completely wrong fixture.
What to check:
- The complete product code, not just the model name
- The finish code—is it the standard white or a custom RAL? A fixture like the Poulsen Panthella floor lamp comes in a dozen finishes. The wrong one is an expensive mistake.
- The voltage configuration if you're sourcing for a non-domestic market
The numbers said go with the visually similar code from a different product line to save a few dollars per unit. My gut said stick with the specified code even though it cost more. Went with my gut. Turns out the cheaper option had a different mounting bracket that would've required additional labor. The 'savings' would've been eaten up by installation costs.
2. Confirm the beam angle and distribution
This is the mistake I see most often on first-time commercial orders. A fixture looks right in the showroom but throws light completely differently in a real space.
Why it matters: A Louis Poulsen chandelier like the Artichoke is designed for a specific light distribution. If you're specifying it for a entryway or lobby, the beam angle determines how much of that iconic fixture is actually visible and how much just lights the ceiling.
Quick check:
- Request the IES file or photometric data, not just the catalog image
- Compare the beam angle to the ceiling height and room dimensions
- For pendant fixtures, check whether the light distribution is direct, indirect, or diffused
I still kick myself for not pulling the photometric data on a project early in my career. The fixtures looked stunning in the catalog, but in the actual space, the beam was too narrow and left the walls feeling dark. The rework cost us about $4,000 in new trim rings and labor.
3. Cross-check the color temperature across the entire order
When you're ordering fixtures for a single zone—say, a hotel lobby or a restaurant—the color temperature needs to be consistent. But different fixtures from different product lines might ship with slightly different LEDs unless you specify it clearly.
What I've learned: Even within the same brand, a Louis Poulsen floor lamp from the Panthella series might have a different LED module than a pendant from the same series if the order combines different generations of the product or different markets.
My process:
- Write the color temperature on every line item of the PO, even when it seems obvious
- Request a color consistency test report from the batch, especially for orders over 50 units
- Specify that 3000K means exactly 3000K, not 'warm white' (which can range from 2700K to 3200K depending on the manufacturer's interpretation)
Every spreadsheet analysis pointed to ordering from the distributor with the better price on the whole batch. Something felt off about their color temperature spec being listed as 'warm white' instead of a specific Kelvin value. Turns out they were shipping a mix of 2700K and 3000K modules. Caught it before installation started, but that was close.
4. Double-check the dimming compatibility with the control system
This one gets people often because it's not visible until installation is complete and someone flips the dimmer switch.
Three things to verify:
- What dimming protocol does the fixture support? (0-10V, DALI, Triac, PWM)
- What protocol does the building's control system use?
- Are there compatibility issues between the specific LED driver and the dimmer? Some require specific brands or models to be listed as compatible.
Even after choosing the specific dimming driver, I kept second-guessing. What if the LED modules hum at low levels? The two weeks until the test installation were stressful. Dodged a bullet when I insisted on a small-sample test before full production—the first driver option did produce a noticeable buzz at 20%. Swapped it out before 200+ units were produced.
Bottom line: Request a sample or at least a written compatibility statement from the manufacturer showing the specific dimmer model.
5. Check the physical dimensions against the ceiling plan
This one sounds obvious, but I've seen a chandelier that was specified for a hotel lobby—a beautiful bird chandelier design—that turned out to be 6 inches wider than the architectural drawings allowed. The problem was caught during mock-up, but it required a last-minute structural change that cost time and goodwill.
What to check:
- The fixture's overall diameter and height, including any canopy
- Clearance from the ceiling to the top of the fixture (some pendants have decorative top caps that add height)
- Weight capacity of the ceiling mounting point—especially for heavier fixtures like a multi-arm chandelier
- Minimum drop length relative to the ceiling height. A fixture like the Panthella floor lamp is fine, but a pendant version might be too low for a space with a low ceiling.
Approved the order and immediately thought 'did I check the ceiling clearance on that recessed entry chandelier?' Didn't relax until the site photos came back showing it fit perfectly. So glad I asked for the 3D model file before ordering. Almost went off the catalog dimensions alone, which didn't show the decorative mounting bracket that added 3 inches to the overall height.
6. Validate the IP rating against the room classification
This is especially important for commercial projects. The building code will specify the minimum IP rating for different zones, but sometimes spec sheets list an IP rating that's just barely compliant.
Real example: I received a batch of what I thought were IP65-rated downlights for a bathroom zone. The spec sheet said IP44. Normal tolerance for bathroom splash zones is IP45 minimum. The vendor claimed it was 'within industry standard for similar applications.' We rejected the batch, and they sourced compliant units at their cost. Now every contract includes IP rating requirements with specific test standards.
Checklist:
- What IP rating does the building code require for each zone?
- Does the fixture's IP rating cover the entire unit or just the lens?
- For outdoor or semi-outdoor spaces (like an entryway), verify weather resistance beyond just IP—check salt-spray or UV resistance if applicable
I ran a blind test with our quality team: same fixture in two different IP ratings with indistinguishable visual appearance. 100% of the team identified the higher-rated fixture as 'more suitable' for the application once they knew the test data. The cost increase was about $12 per fixture. On a 400-unit run, that's $4,800 for measurably better compliance and fewer callbacks.
7. Review the warranty terms and replacement parts availability
This is the one most people skip because it feels like a 'legal' thing, not a 'quality' thing. But I've learned it matters in practice.
Questions I ask before approving:
- What's the warranty period, and does it cover the LED module specifically (not just the fixture body)?
- Are replacement parts stocked locally, or would a failure require international shipping with customs delays?
- How long does the manufacturer guarantee availability of replacement parts? Some premium brands like Louis Poulsen support products for decades, but that varies.
- What's the process for warranty claims? Do they require the fixture to be returned, or can a field replacement be authorized?
One of my biggest regrets: not asking about replacement parts availability for a order of ceiling fixtures for a boutique hotel. The LED driver failed on three units within the first year. The manufacturer honored the warranty but required the fixtures to be shipped back to Europe for repair. The hotel had two dead lights for six weeks. The goodwill I lost with that client took two years to rebuild.
Common Mistakes I Still See
Assuming standard means standard. A 'standard 4-inch recessed can' can vary by half an inch between manufacturers. If you're installing a fixture like a Louis Poulsen recessed light into a standard housing, verify the exact dimensions.
Skipping the sample request. The cost of ordering a production sample is nothing compared to the cost of ordering 200 units and discovering the finish is wrong. I've seen this happen with the Panthella series—the 'matt white' from one batch vs another can look subtly different.
Trusting renderings over data. A nice product shot tells you nothing about beam angle, color rendering, or dimming behavior. Always ask for the technical data sheet.
Bottom line: This checklist has saved me an estimated $8,000 in potential rework over the last year. Five minutes of verification beats five days of correction. That said, every project has its own quirks—this list covers the most common misses, but don't be afraid to add your own checks based on project-specific requirements.
Pricing note: This checklist is based on my experience with commercial lighting specification and procurement. Verify current pricing and terms directly with your supplier.