If you're replacing chandeliers in a hotel lobby, an office atrium, or the retail space that keeps losing tenants, this checklist is for you. I've handled commercial lighting orders and installation support at Focal Point for six years, and I've made (and documented) more mistakes than I'd like to admit — roughly $22,700 worth, by my last count. Now I maintain the checklist I wish I'd had before the first one.
Four things to verify on any chandelier project, in order:
- Understand what the focal point of a lens controls in your light distribution.
- Know where the focal point for a concave lens is located — this one trips up almost everyone.
- Choose the chandelier style with your eyes open: diamond, turquoise, or something in between.
- Rewire the light fixture the right way, in the right order.
Let's walk through each one.
Step 1: What Is the Focal Point of a Lens, and Why Should a Buyer Care?
The focal point of a lens is the point where parallel incoming light rays converge after passing through the lens — or, for diverging lenses, the point they appear to come from. That's the textbook answer. Here's the practical one: it's the thing that decides whether our downlight reads as a tight accent, a wide wash, or an accidental flashlight on the ceiling.
Let's make this concrete. In commercial lighting, the lens inside a downlight or spotlight determines what the beam actually does at your ceiling height. A converging lens brings light together; its focal length controls where that convergence happens. Pair the wrong lens with a 16-foot lobby ceiling and the artwork you're highlighting ends up in shadow while the plant beside it gets a solo. (Which, honestly, was a classic first-year-project mistake on a 2018 order.)
Full disclosure: Focal Point is one of those manufacturers who make both the optical lenses and the finished fixtures. That's how this checklist came to exist — the wrong-lens phone calls came to my team, so I started documenting them. These days, when a client asks us to spec a fixture, we treat the lens question as the first requirement, not the last detail.
Checklist item: Before you approve any fixture, ask for the beam angle and the lens type. If the supplier can't tell you anything about the lens in their downlight, that's a red flag. You're not buying a light bulb — you're buying an optical system.
Step 2: Where Is the Focal Point for a Concave Lens Located?
Here's where I have the scar tissue.
For a concave lens, the focal point is located on the same side of the lens as the incoming light. It's a virtual point — not a real convergence. If you sketch the rays, light enters the lens, spreads outward, and if you extend those diverged rays backward with dashed lines, they appear to meet at that virtual focal point. Put a screen anywhere you like: you won't catch an image there.
In my first year handling commercial orders, I assumed a concave lens would pull light tighter because it curves inward. Intuitive, wrong. A concave lens is a diverging lens. It spreads light. We ordered 24 downlight lenses with that assumption baked in, and the result was a lobby floor with a wide, uneven wash and no punch on the feature wall. The fix cost $2,340 in replacement optics plus a very polite but very firm email from the general contractor.
The practical takeaway: if you need to widen a beam — say, converting a narrow accent fixture into a wall wash — a concave lens is a legitimate tool. If you want to concentrate or tighten light, you're looking for a converging (convex) element. "Concave" doesn't mean "more focus." It means less.
Checklist item: Confirm whether the lens in your fixture is converging or diverging before you sign the change order. Ask for the lens specification in writing, not just the product name.
Step 3: Choose the Chandelier — Diamond or Turquoise
Once the optics are sorted, you get to pick the thing people actually see. Two styles dominate the commercial requests we receive: diamond chandeliers and turquoise chandeliers.
A diamond chandelier in commercial terms usually means a crystal chandelier — cut glass or acrylic facets that catch the light and throw small sparks around the room. It's the classic "we want this lobby to feel expensive" move, and it works. But the word "diamond" is doing a lot of work in that sentence. Unless you're buying a fixture actually set with diamonds (you're not), the spec should read "crystal," "facetted glass," or "acrylic." When a vendor quotes a "diamond chandelier" and can't tell you what the crystal actually is, their marketing sheet is doing the talking.
Turquoise chandeliers are at the other end of the spectrum — literally and figuratively. They've been showing up in boutique hotels, resort interiors, and branded retail, where the fixture becomes the entire color story. A turquoise chandelier can be the identity of a space. The issue I've hit more than once is color consistency across a multi-fixture order. Turquoise is a specific color until you put two "turquoise" fixtures side by side and one looks teal while the other leans navy. Glass batches vary. Painted finishes vary. And in a hotel with a two-story atrium, that variance is visible to every guest who rides the elevator.
This is also where advertising claims need a second look. Per FTC guidelines (ftc.gov), product claims have to be truthful and substantiated. When a supplier markets a fixture as "full-lead crystal" or "hand-polished diamond," that's a claim — and it's reasonable to ask for the documentation behind it. We walked away from a 2023 order because the brochure said crystal and the cut sheet said acrylic. Not because acrylic is bad, but because the claim wasn't true.
Even after we shortlisted a turquoise chandelier for a resort project, I kept second-guessing. What if the finish read more "craft fair" than "boutique hotel"? The three weeks until the finish sample arrived were stressful. The sample fixed the doubt — and we also got the supplier's color-variation policy in writing, which turned out to matter on the final order.
Checklist item: For any multi-fixture chandelier order — diamond, turquoise, or both — request a physical sample first and ask how the supplier handles color variation between production batches. Get the answer in writing.
Step 4: How to Rewire a Light Fixture — the Order We Use
Now the part that generates the most phone calls: how to rewire a light fixture. Rewiring a chandelier isn't difficult. It punishes people who skip steps. Here's the exact order we use on every project, and the order we'll hand an electrician if they ask.
4.1. Kill the power at the breaker — not at the wall switch
The wall switch is not a disconnect. Turn off the breaker, then confirm with a non-contact voltage tester. I don't care that you're "pretty sure" it's off. Verify it. That's the advice from someone who's had to explain the resulting pop to a hotel maintenance manager.
4.2. Take photos before you disconnect anything
Photograph the existing wiring from multiple angles — clear, close-up, well-lit. I still kick myself for skipping this on a 12-arm chandelier in January 2024. What followed was a two-week troubleshooting delay that was 100% avoidable. If I'd photographed the original wiring, we'd have known which conductors belonged where without re-engineering the whole fixture.
4.3. Label, then disconnect
Masking tape and a marker are fine. Label each wire before you disconnect it, and keep the labels on until the new wiring is in place. If the fixture has six arms, you'll have six labeled pairs and zero mystery about which is which.
4.4. Inspect the old wiring while you're in there
Cracked insulation, brittle copper, green corrosion — if the old wiring looks tired, replace it while the fixture is already open. That's the cheap moment. The expensive moment is three months later, when it's hanging 20 feet up in an atrium and starts flickering. Also check the wire gauge: most chandeliers run 14–18 AWG depending on wattage. Someone else's undersized wire is a fire risk with a fancy address.
4.5. Strip, connect, and cap correctly
Strip about three-quarters of an inch. Use the right wire nut size for the wire count and gauge — too small and the connection is loose; too big and it won't bite. For standard fixtures, connect black to black, white to white, and bare or green to ground. If the old wires are cloth-covered and all the same color, rely on your photos and labels, not on guesswork.
4.6. Test once before you close it, and again after
Put a bulb in, restore power, confirm it works. Then mount the canopy, restore power, confirm again. Yes, twice. The second test catches the wire that got pinched or the connection that loosened while mounting. It sounds like overkill until it isn't.
Switching to this photo-and-label process cut our average chandelier rewire from five days to two. It's not glamorous. It's just efficiency — and efficiency is what pays for margins on a fixed-bid project. The checklist has caught 17 potential errors for us in the past 10 months, including three fixtures that were about to go up with no ground connection at all.
Mistakes I Keep Seeing (and the Ones I Made Myself)
- Don't trust wire colors on old fixtures. Faded, cloth-covered wiring can be any color. Documentation beats memory, and memory is what gets people into trouble.
- Never skip the ground on a metal chandelier. It's non-negotiable, and it's the first thing an inspector checks.
- Check the fixture's voltage rating against your supply. A US-spec fixture on a 220V line without the right driver is a smoke machine.
- Verify what "diamond" or "crystal" actually means in the spec. If a vendor can't substantiate that claim, question everything else in the brochure.
- If you're hanging a turquoise chandelier in a humid environment — poolside, spa, coastal lobby — ask about the finish. Some painted turquoise finishes don't love humidity, and "it chipped after six months" is not a call you want to make to a client.
The most frustrating part of this work is how repetitive the mistakes are. You'd think a documented checklist would eliminate them — and honestly, for the people who use it, it almost has. Trust me on this one: the extra hour you spend on photos, labels, and a lens spec check is nothing compared to the callbacks you won't have to make.