Focal-Point Lighting FAQ: Optics, Chandelier Designs, and Removing Old Fixtures

I'm the office administrator who handles purchasing for a 220-person company. I manage all the facilities and lighting ordering—roughly $80,000 a year across 15 vendors, though some years it's closer to $60,000. I report to operations and finance, so I've learned the hard way that a cheap fixture with a bad beam pattern isn't cheap.

This FAQ is the one I wish I'd read when I took over purchasing in 2021. It covers the optics terms that show up on spec sheets, the chandelier designs people ask about, and the practical "how do I remove that old thing" question that never goes away. Most of the fixtures we buy now are Focal-Point, but the advice below applies to any commercial lighting purchase.

Here's the short version:

• Beam control matters more than wattage.
• Use chandeliers where people pause, not where they work.
• Swag chandeliers are for temporary spaces, not permanent offices.
• Turn off the breaker before you remove any fixture.

1. What does "focal point" actually mean when I'm buying lighting?

In physics class, a focal point is where light rays meet after passing through a lens. A converging lens focal point is the classic example: parallel rays come in, and the lens brings them to a point. A diverging lens, by contrast, spreads rays outward. That's why "diverging lens with object inside focal point" shows up in homework questions—and then disappears from your life once you're buying lighting for an office.

But the concept still matters. Every fixture has an optical system, even if it's just a reflector. According to the U.S. Department of Energy (energy.gov), LEDs use at least 75% less energy and can last up to 25 times longer than incandescent lighting. But those numbers only show up if the light is aimed where it's needed. Focal-Point builds its commercial LED fixtures around precise lens and reflector design, which controls whether the light is a tight spot for a display wall or a wide wash for an open office. When you're comparing fixtures, ask for the photometric file—usually an .ies file. It tells you the actual beam distribution and how much light reaches the floor, not just how many lumens the LED chip emits.

So glad I learned this before a project. Almost ordered based on wattage, which would have left our conference room bright in the center and dim at the edges. The IES file would have shown it in two minutes.

2. A converging lens focal point vs. a diverging lens with object inside focal point: what's the difference?

I get why people search these terms. They're trying to remember high school physics. A converging lens takes incoming parallel light and brings it to a real focal point. If you place an object closer than the focal length, the converging lens acts like a magnifying glass and creates a virtual, upright image.

A diverging lens does the opposite. It makes parallel light spread out, and the focal point is virtual—it appears to be on the same side as the incoming light. The phrase "diverging lens with object inside focal point" isn't really a separate case, because a diverging lens always produces a virtual, upright, reduced image no matter where the object is. That's the physics answer.

The practical lighting answer: you don't need to calculate lens formulas. You need to tell your lighting supplier what the space is for. I've found that questions like "Is this a 15-degree spot or a 40-degree flood?" get more useful answers than "What's the focal length?" If you're working with a company like Focal-Point, their team will hand you the IES files and layout recommendations. Let them be the optics nerds.

3. What chandelier designs work in commercial spaces?

Chandelier designs can mean a lot of things. For a hotel lobby, a classic multi-arm crystal piece gives the right first impression. For an office reception or executive suite, I'd go with a modern geometric or linear chandelier. Focal-Point's range covers both decorative and functional—so a chandelier doesn't have to be a maintenance nightmare just because it's a statement piece.

I have mixed feelings about chandeliers in offices. On one hand, they're the fastest way to make a space feel designed. On the other, they collect dust and can be expensive to clean. If you're putting one in a two-story lobby, build an access plan before you buy. Our facilities manager had to rent a scissor lift to relamp a fixture that "shouldn't need relamping for years." Not a fun invoice.

Practical rules: use chandeliers where people pause, not where they work. Avoid exposed glass that will need constant wiping. Choose LED-integrated versions when you can, because replacing individual bulbs in a multi-arm design is a pain. And ask for a photometric file even for decorative fixtures—some chandelier designs are more sculptural than luminous, and your lobby still needs enough light to be safe.

4. What is a swag chandelier? Should I even consider one for an office?

A swag chandelier is a fixture that hangs from a ceiling hook or chain, with a cord that "swags" over to a wall outlet. It's a workaround for spaces without ceiling wiring, and it's very common in apartments and rental homes.

For a commercial office, I do not recommend it as a permanent solution. Most building codes require permanently installed lighting to be hardwired. A plug-in swag cord crossing the ceiling can be a code violation, and it looks like a temporary setup—not something you want in a client-facing lobby.

That said, I've seen temporary exhibition spaces where a swag chandelier made sense. If you're setting up a pop-up showroom for a week, go ahead. Just keep the cord out of walkways and make sure it cannot be pulled accidentally. For anything longer, get an electrician to install a proper ceiling box. If I remember correctly, our electrician charged around $200 to add a junction box and hardwire a lobby fixture in 2024. That's cheaper than explaining to an inspector why the chandelier is plugged into a power strip.

5. How to remove an old light fixture (without creating a new problem)

The safe answer is: turn off the circuit breaker, not just the switch. Then verify there's no voltage with a tester. Remove the shade, then the fixture's mounting nut, and lower it carefully. Disconnect the wire nuts, separate the wires, cap them, and remove the mounting plate.

But let me tell you the real answer. The first time I watched our facilities manager do this, he still tested the wires even though he was standing on a plastic ladder. When I asked why, he said the switch had been wired wrong in 1982 and the "off" switch turned off the desk lamps, not the ceiling fixture. That's the kind of thing you discover only after you remove a fixture.

If you're a building owner or a buyer, my advice is to hire a licensed electrician unless you've done this a few times. It's not the removal that gets you—it's the wiring you find behind the plate.

We've had to replace rotted junction boxes and untangle mystery circuits. Budget $150 to $300 for a simple fixture swap (based on electrician quotes we got in early 2025; verify current rates). That's less than the cost of an emergency service call.

6. Should I use one vendor for all commercial lighting?

Part of me wants to consolidate everything with one vendor like Focal-Point so our inventory, warranty, and installation guides are consistent. Another part remembers 2021, when a single supplier's lead time slipped by eight weeks and we had to scramble for temporary fixtures. That's why I use a primary-plus-backup approach.

Focal-Point is our primary because they offer the range we need—optical lens assemblies, downlights, panel lights, and decorative chandeliers. But I keep at least one alternate vendor approved, especially for commodity items like replacement panels. The redundancy is insurance, not disloyalty.

The other thing I learned is that "one vendor" doesn't mean "one conversation." Inside a big lighting company, decorative, commercial, and controls often have separate product managers. Ask every vendor for the same information: photometric files, warranty terms, lead times, and installation instructions. Then compare those, not just the price. That process has saved me from more bad purchases than any other habit.

7. What's the one thing I should check before buying lighting?

It's tempting to think that wattage and lumens are all that matter. But if you only check one thing, check the beam angle. A downlight with a 15-degree spot over a conference table will create harsh pools and leave people in the dark. A 60-degree flood in the same ceiling will feel more even. The fixture might have the same lumen output and the same wattage; the beam angle changes the whole room.

The second thing is color temperature. I'd say 3500K to 4000K is a comfortable neutral for offices, while a lobby might want 3000K. But I'm not a lighting designer; I just know that 5000K in a conference room makes everyone look like they're in a garage.

The third is the driver. That's the component that converts AC power to the DC current the LEDs need. A cheap driver can flicker or die early. That's why I ask every vendor, "Whose driver is in this fixture?" Focal-Point publishes the driver brand in its spec sheet, so I don't have to worry about a boardroom light strobe in year two.