When existing poles have different heights, plan commercial lot lighting one mounting condition at a time. Don't apply one fixture or spacing rule to the whole site. Record each pole's height, location, fixture, aim, and surroundings, then group only the poles whose conditions truly match for a shared review.
This method is a planning screen, not an engineered layout. A qualified lighting professional still needs to test the proposed design against your project's criteria. Local rules come from the jurisdiction where the lot sits.
Plan by Mounting Condition, Not One Sitewide Rule
A mounting condition is the full setup at one pole: its height, where it stands, the fixture on it, which way that fixture points, and what surrounds it. Height is only one part of that. The U.S. Department of Energy's FEMP guide says the lot's design, the luminaire's features such as distribution, and how luminaires are placed around the lot all affect the lighting system. "Distribution" means the pattern a fixture uses to spread light across the ground.
That is why a spacing rule that works on one row of poles may not carry over to the next. As an illustration, two poles at the same height can still perform differently if one stands under a tree line and the other faces open pavement. A shorter pole next to a taller one raises a coverage question, but the answer depends on the other inputs too.
The DOE guide does pair a lower mounting height with a lower-output fixture. That pairing comes from its solar-canopy example, though, so it doesn't set a rule for mixed-height poles in your lot. Use each pole's recorded conditions to drive the plan for commercial lot lighting instead.
Build a Pole-by-Pole Site Record
Start with a numbered site plan, then fill in one record for every pole. The table below covers the inputs a reviewer needs before conditions can be compared.
| Record for each pole | What to capture | Why it matters |
|---|---|---|
| Mounting height | Fixture height, marked verified or estimated | Sets the fixture's relation to the pavement |
| Location and spacing | Pole ID on the site plan, distance to neighbors | Shows where coverage may overlap or gap |
| Fixture and distribution | Make, model, label data, photometric file | Needed to model where light lands |
| Orientation | Arm direction, head tilt or aim | Matching fixtures aimed differently differ |
| Mount type | Arm, tenon, slipfitter, or other attachment | Shapes retrofit options |
| Obstructions | Trees, signs, walls, canopies | Can block light from reaching the surface |
| Site zone | Parking rows, drive aisles, entrances, building edges | Different areas may need separate checks |
Label every entry as verified, estimated, or missing. A height taken from as-built drawings carries more weight than one guessed from the ground. A missing fixture model tells the reviewer that pole can't be modeled yet. Treat those differences as part of the record, not as gaps to fill with assumptions.
Obstructions earn their own row because trees and vegetation can obscure light around a parking lot. The DOE guide also advises planning for future canopy growth, so note young trees near poles, not just today's foliage.
Two details help later. First, write down how each fixture attaches, since that affects which parking lot light mount adapters a retrofit could use. Second, flag any head tilted toward a property line. Our guide to aiming floodlights to reduce light trespass walks through the aiming and shielding checks.
Screen Poles for a Shared Coverage Review
Group poles for an initial review only when every recorded condition is comparable. Any meaningful difference, including height, gets its own coverage question.
- Line up the records side by side. Compare height together with spacing, fixture and distribution, orientation, and site zone. Don't sort by height alone.
- Flag every difference. A pole that matches its neighbors except for height gets flagged. So does a pole at the same height that sits under trees or points a different way.
- Write one coverage question per flag. For example: "Does the shorter pole near the entrance leave a dark band toward the drive aisle?" A specific question gives the reviewer something to test.
- Group the unflagged poles for a shared first pass. Comparable records can share one review. That grouping is a starting point, not proof that one approach covers them all.
- Let the reviewer confirm the final groups. The photometric review may merge flagged poles back into a group or split a group further.
This screen is a planning tool, not an engineering threshold. Placement and distribution belong in it because the DOE guide treats lot design, luminaire distribution, and placement as linked inputs. It is not a grouping rule from DOE. Consider a lot where heights differ but everything else matches. That lot may end up with one shared review question. A lot where spacing, aim, and tree cover also vary will likely produce a longer list of separate questions.
Send the Layout for Project-Specific Review
Hand off your record with a clear split of who decides what. You supply the site facts. A qualified lighting professional judges the layout, and the local authority rules on local requirements.
- You (owner or facility manager): the numbered site plan, the completed pole record with verified, estimated, and missing labels, any spec sheets or photometric files, your flagged coverage questions, and the areas you care most about, such as entrances or walkways.
- Qualified lighting professional: confirms the project criteria, builds the photometric layout, and decides whether flagged poles can share an approach or need different treatment.
- Local authority: any pole-height limits, required light levels, permits, or light-spill rules for your site's jurisdiction. No single rule applies nationwide.
The DOE FEMP guide describes software that can calculate average, maximum, and minimum values, and even a specified range of values, for a parking lot layout. Ask your reviewer which of those outputs apply to your project and what criteria they will be compared against. Calculated numbers only become a decision once they are measured against criteria the project has adopted.
If you have been sizing fixtures from lumens alone, our article on when a lumens estimate is not enough explains where that shortcut stops working. Once your pole record is complete, take it to a qualified reviewer. You can start that conversation through our lighting design page or sketch early options in our online lighting layout tool before the formal review.
FAQs
What if I can't identify a fixture or find its photometric file?
Mark that pole as "missing" in your record instead of guessing. Check the label on the fixture, original submittals, and as-built drawings first. If nothing turns up, tell your reviewer. They can decide whether to treat that pole as unknown or plan around a replacement fixture with known data.
Do different pole heights automatically mean different fixtures?
No. A height difference is a reason to examine that pole, not a verdict. The right fixture depends on distribution, placement, aim, site conditions, and the criteria set for your project. A photometric review settles that question, and it may show that one fixture type works at several heights or that it doesn't.
Who sets the light levels and rules my commercial lot lighting must meet?
Project criteria are set for your specific site, normally by you working with a qualified lighting professional. Legal requirements such as height limits, permits, or light-spill rules come from your local jurisdiction. Contact the local planning or building department before you finalize a design, because requirements vary by location.
Should signs and building facades be treated separately from the parking surface?
Often, yes. The DOE guide notes that parking lot luminaires mainly light the horizontal parking surface, and it treats vertical features such as signage or building facades as a separate consideration. Record those features as their own zones and ask your reviewer whether they will be evaluated apart from the pavement.
