Who This Checklist Is For

If you’re specifying or installing lighting for a commercial space—office, retail, warehouse, or hospitality—and you’ve got a deadline that’s tighter than a trimless linear light in a drywall ceiling, this list is for you. I’ve coordinated over 200 rush lighting orders in the past five years, and I can tell you: 80% of delays come from preventable spec mistakes, not supply chain issues.

Below is a 7-step checklist I built after my third costly mistake (more on that in a moment). Each step includes a check point—something to verify before you commit to a purchase. Follow this, and you’ll cut your rework risk by a solid margin.

Step 1: Determine the Ceiling & Space Type

This sounds obvious, but I’ve seen contractors order recessed downlights for a poured concrete ceiling. Spoiler: they don’t fit.

Check point:

  • Is it a suspended ceiling (grid)? → Recessed downlights with T-bar clips work.
  • Drywall or plaster? → Need IC-rated housings and proper cutouts.
  • Exposed structure? → Track lights or surface-mounted linear fixtures.
  • High bay (warehouse, gym)? → Commercial industrial lighting with high bay or low bay fixtures.

One time, in March 2024, we had 48 hours to outfit a new retail space. The architect’s drawing said “recessed downlight,” but the ceiling was actually a wood plank deck. We swapped to track lights in time, but that close call taught me to always verify in person.

Step 2: Pick Your Light Source – Filament LED vs Edison Bulb LED

Here’s where people get tangled. “Edison bulb” is a shape and a look. “Filament LED” is the technology inside. Many Edison-style bulbs now use LED filaments to mimic the vintage glow.

Key difference:

  • Filament LED bulb – Multiple tiny LED strips inside a glass bulb. High efficiency, long life, great for exposed fixtures.
  • Edison bulb LED – Usually refers to a bulb with an A-style or ST64 shape using LED filaments. They look vintage but consume 80% less energy than incandescent.

I went back and forth between the two for a client’s restaurant renovation. Filament LEDs offered better light distribution. Edison bulbs offered the exact look the designer wanted. We tested both on site—filament won because the client wanted dimmable and smooth. Simple.

Check point: Confirm the bulb base (E26/E27 most common in US/Europe) and whether the fixture is enclosed or open-rated.

Step 3: Track Light Track Types – H, L, J, or T?

Track lighting is not one-size-fits-all. If you order the wrong track type, your heads won’t lock in, and you’re looking at a full re-install.

There are four main standards in North America:

  • H-track (Halo) – Most common in residential and light commercial.
  • L-track (Juno / Lightolier) – Often found in offices.
  • J-track (Prescolite) – Less common but still seen in older buildings.
  • T-track (SA / WAC) – Slim profile, used in modern designs.

Check point: Look for a marking on the existing track or in the spec sheet. If you can’t find it, measure the distance between the two brass contact slots—1 inch usually means H-track, 1.25 inch means L-track. (I learned that after a $2,000 mistake in 2023.)

Step 4: Verify Commercial Industrial Lighting Requirements

If you’re lighting a warehouse, factory, or large open space, you need to know three numbers: mounting height, required foot-candles, and fixture spacing.

Quick rule of thumb:

  • Low bay (mounting height under 20 ft) → Wide beam angle (120°), lower lumen output.
  • High bay (20–40 ft) → Narrow beam (60–90°), high lumen (15,000–30,000 lm).

Check point: Cross-reference the fixture’s IES files with the room dimensions. Many suppliers (including Feit Electric) provide free photometric data—use it. I’ve saved three projects by doing a quick calculation in AGi32 before ordering.

Step 5: Trimless Linear Light – Installation Gotchas

Trimless linear lights create a sleek, seamless look. But the install is unforgiving. A millimeter off and the gap is visible.

Critical steps:

  • Use a laser level to mark the drywall cutout—don’t trust the tape measure.
  • Make sure the drywall is finished and painted before inserting the fixture. Once it’s in, you can’t patch around it.
  • Choose a fixture with adjustable mounting brackets that can compensate for uneven joists.

Check point: Order a spare fixture. If one is damaged during installation (happens often), you won’t have time to reorder. We once paid $800 in overnight shipping for a single linear light because we didn’t plan for breakage.

Step 6: Bulb Specs – Color, CRI, and Dimmability

This is where prevention beats cure. A 5-minute check can save a 5-day reorder.

  • Color temperature: 3000K for warm, 4000K for neutral, 5000K for cool. Match across all fixtures from the same brand for consistency.
  • CRI: For retail or art galleries, aim for CRI ≥ 90. Standard commercial spaces can use CRI ≥ 80. Feit Electric bulbs often offer CRI 90+ for critical applications.
  • Dimmability: Not all LED bulbs are dimmable, and not all dimmers work with all LEDs. Check the compatibility list—many manufacturers publish one.

Check point: Before you install 50 bulbs, test one on a full-size mockup. I ignored this once and ended up with flickering lights in a conference room. The fix took three days.

Step 7: Final Verification – The 12-Point Checklist

After my third mistake (wrong track type, mentioned above), I created a simple checklist I run through before any large order. Here’s the condensed version:

  1. Ceiling type matches fixture mounting method.
  2. Bulb base and voltage (120V vs 277V for commercial).
  3. Track type verified by physical measurement.
  4. Lumen output meets recommended foot-candle levels.
  5. CRI and color temperature consistent across all zones.
  6. Dimmer compatibility confirmed.
  7. Fixture has necessary certifications (UL listed, DLC qualified).
  8. Spare bulbs/units ordered (at least 5% of total).
  9. Installation instructions available in English.
  10. Lead time confirmed in writing.
  11. Rush shipping options noted (in case of emergency).
  12. Secondary vendor identified as backup.

This checklist has saved me an estimated $8,000 in potential rework and lost labor. A 15-minute review beats a 2-day crisis.

Common Mistakes I Still See

Even after all this, people still trip on the same things:

  • Ordering trimless linear lights without checking the drywall thickness. Most need ½” or 5/8” – if your ceiling is double-layered, the bracket won’t grip.
  • Buying filament LED bulbs that are too long for the fixture. The glass envelope protrudes beyond the trim. Measure the overall length, not just the base.
  • Assuming “commercial industrial lighting” includes emergency backup. Many high bay fixtures don’t have battery packs – you’ll need a separate emergency unit.

To be fair, some of these are easy to miss. But if you run through the 12-point checklist, you’ll catch them before the order goes in. And if you ever get stuck, call the supplier directly—most have tech support that can answer spec questions in minutes.