When mounting is constrained, warehouse lighting selection starts with the site, not the fixture. First, record the actual height, mounting points, orientation, obstructions, and task areas. Then check each candidate's documents for its exact SKU and configuration against that record.
A candidate moves forward only when those documents cover your conditions. If a detail is missing, the candidate goes on hold. If a document conflicts with a site condition, it's out. A product family name can't settle fit by itself. When no candidate clears the screen, the next step is a project review with a prepared packet, not a guess.
Screen Candidates Against the Recorded Constraints
Each candidate gets one of three statuses, based on how its exact-configuration documents match your recorded site conditions. Build the record first so every candidate is checked against the same inputs.
Record the Site Condition
Give every entry a label: measured (you took the reading), confirmed (it comes from drawings, the building owner, or your electrician), or unknown.
- Mounting height and position: the actual height at each intended point, in feet and inches, and where that point sits relative to racks and aisles.
- Available mounting points: structure, existing boxes, or hanging points you can use, and any you can't.
- Orientation: whether the fixture has to hang, surface mount, or line up with an aisle or beam.
- Obstructions: ducts, sprinkler lines, beams, conveyors, or rack tops that block placement or light.
- Clearance needs: space the project requires around each fixture location.
- Task area and geometry: where the work happens, and whether the area is aisle-and-rack or open floor.
- Known electrical conditions: supply and control details, only as your electrician or the owner has recorded them.
If you haven't measured or confirmed a value, write "unknown." An assumed height or clearance can make a candidate look like a fit when no one has checked.
Assign Each Candidate a Status
Run the screen on the exact SKU and configuration you would order. A family page can list several mounting options or distributions. Only the spec sheet, installation instructions, and photometric files for your configuration show which of those options apply.
| Status | Documentation condition | Next decision |
|---|---|---|
| Advance | Documents cover your mounting method, range, clearances, electrical inputs, and photometrics | Compare with other advanced candidates |
| Hold | A required condition is missing, unclear, or tied only to a family name | Get the exact document or send it to review |
| Rule out | A document conflicts with a required site condition | Drop it from this project |
Hold is the status that protects you most. Missing information doesn't prove a fixture can't fit, so don't reject a candidate for that reason, and don't advance it either. Rule a candidate out only when a document states something that conflicts with a recorded requirement. One example is an installation method that needs a mounting point your structure doesn't have.
Match Photometric Evidence to the Work Area
Area geometry tells you where to look in the photometric data. It doesn't tell you which fixture fits.
For each advanced candidate, compare the data at the intended mounting condition and orientation, at the points where work actually happens. One warehouse lighting guide explains that light quantity is measured at the task point and plane, either horizontal or vertical. The same guide notes that the vertical plane matters when items are stored on stacks.
Aisle-and-Rack Areas
Rack aisles move many of the task points off the floor and onto the rack faces.
- Mark each aisle and the task locations that matter, such as pick faces, rack labels, and upper storage levels.
- Include the vertical plane of the rack faces where items are stacked, not just the floor.
- Compare the exact configuration's distribution and photometric files at the planned height, position, and orientation relative to the aisle.
- Keep the candidate on hold until you have data for your conditions. An "aisle" optic label alone doesn't show what happens at your rack faces.
Tall racks add more vertical points to check. Our guide to high-rack photometric planning covers this in more depth.
Open-Floor Areas
On open floors, the work zones set the comparison points, not the aisle lines.
- Mark zones such as receiving, packing, and staging, and the planned mounting position above each one. It helps to map warehouse task zones before you compare any data.
- Note whether each task sits on a horizontal surface, like a packing table, or a vertical one, like a staging wall.
- Compare photometric information at those zone locations under the planned mounting condition, including any obstructions between fixture and task.
- Wait for a calculation before you judge the result. No light level at your zones is known until someone runs a calculation with the exact configuration's files for this layout.
Prepare a Project Review When Fit Is Unclear
Send the question to a project review when no candidate reaches Advance, or when electrical compatibility is still unknown. A complete packet lets the reviewer work from your conditions instead of starting over. Our walkthrough on how to organize a project brief shows how to label photos and measurements.
- Site measurements and layout: a labeled plan or photos showing mounting points, heights, obstructions, clearances, work zones, and aisle and rack geometry. Keep each value's measured, confirmed, or unknown label.
- Project and electrical facts: recorded supply and control conditions, existing fixtures, and project requirements such as owner specifications or control expectations.
- Exact product documents: the full SKU and configuration, the current spec sheet, installation instructions, photometric files, and documents for any mounting accessory the configuration depends on. For fixtures from our linear high bay collection or UFO high bay series, pull current sheets from our specification download page.
- Unresolved questions and owners: write each open condition as a question and name who answers it. Photometric questions go to a lighting designer, electrical questions to a licensed electrician, and code questions to the local authority having jurisdiction.
This screen isn't wiring guidance or a code decision. Electrical compatibility belongs with a licensed electrician. Code requirements depend on the project's US jurisdiction, so confirm them locally instead of assuming one nationwide rule.
Take the final screening decision to action: advance only fixtures with complete, verified documentation for your recorded constraints, and route any held options with open questions to review before ordering. If you are evaluating our models and documentation still leaves fit uncertain, submit your packet through our project lighting design page for layout review.
FAQs
What if two documents for the same fixture disagree?
Treat the candidate as on hold. Ask the manufacturer which document revision is current for your exact configuration. Don't pick whichever version looks better for your site. Once the current document is confirmed, run the screen again with that version only.
What should I do if I can't identify a fixture's exact configuration?
Keep it on hold until you have the full SKU or ordering code, from the product label, the quote, or the manufacturer. A family name can cover several mounting methods, optics, and electrical options. Without the exact configuration, you can't know which documents apply.
Can I change the mounting position to make a candidate work?
You can, but a new position is a new site condition. Update the record and screen every candidate again, because a fixture that was on hold may now fit and one that advanced may not. Height also interacts with output and beam angle, as our guide on high bay mounting height explains. Any change to structure or supports needs sign-off from the right project professional.
Does a UL listing, DLC listing, or IP rating confirm fit for a constrained mount?
No. Each one covers something different. UL or ETL listing is a safety listing for a specific product. DLC Qualified status shows the product appears on the applicable qualified products list. IP65 is an ingress-protection rating and doesn't mean the same thing as wet-location suitability. None of them tells you whether a configuration's mounting method, clearances, or photometrics match your recorded site conditions.
