Sunna Design Solar Lighting: 3 Procurement Mistakes That Cost Me $46,000

The short version

In nine years of buying solar outdoor lighting—bulk flood lights, street lights, sports lighting—I've made 11 documented procurement mistakes. Together they cost roughly $46,000 in wasted budget. The biggest one wasn't choosing the wrong manufacturer. It was signing off on specs that were too vague to verify.

Get every performance claim in writing, with a test method, before you order in volume. That applies whether you're buying 10 fixtures or 1,000, and it applies to bulk flood light orders and custom sports-lighting layouts. You can avoid most of what I went through by following the checklist at the end.

Why I'm qualified to talk about this

Since 2017—or rather, since 2018, because my first year was mostly chaos—I've handled sourcing for community facilities, commercial plazas, and small municipal projects. I'm not an engineer. I'm the person who signs the PO and deals with the consequences. I've personally made (and documented) 11 significant mistakes, totaling roughly $46,000 in wasted budget. I now maintain our team's procurement checklist to keep others from repeating them.

That checklist has caught 47 potential errors in the past 18 months. Most were small. A few would have been another $10,000 mistake. This article is the story behind those errors, and the checklist itself.

Mistake #1: Confusing OEM with private label

My first expensive lesson came from an order I thought was custom. I said private label. The supplier heard put my logo on it. Result: a full pallet of fixtures with our logo and none of the custom specs I expected. We were using the same words but meaning different things. We discovered this when the samples arrived and the mounting brackets didn't fit.

In outdoor lighting, OEM vs private label is not a minor detail:

• OEM means the product is built to your specification. You can choose optics, battery capacity, mounting, and sometimes even the electronic controls. You're responsible for proving the design works.
• Private label means you take an existing product and put your brand on it. It's faster and usually cheaper, but you're not getting a custom product.

Understanding outdoor lighting oem vs private label matters because the two require different conversations. A supplier like Sunna Design, for example, does both OEM and private label support—but you still need to be explicit about which one you're asking for. I've learned to write custom OEM, not just private label, in every RFQ. It doesn't make the supplier move faster, but it prevents the wrong interpretation.

If you're a smaller buyer, this is especially important. The supplier might assume you want private label because it's simpler for you. Sometimes they're right. But if you need a specific beam angle or battery autonomy, private label won't get you there.

Mistake #2: Ordering a bulk flood light by wattage

The second mistake happened on a bulk flood light order. I specified 120W in the PO. The supplier shipped a fixture that consumed 120W of power, but the actual light output was closer to what I would have called an 80W fixture. I had approved the datasheet myself, so there was no one to blame. The surprise wasn't the wattage gap. It was how easily the manufacturer accepted the ambiguous spec.

The issue is semantic: in solar lighting, wattage can mean at least three different things:

• LED power draw
• Solar panel wattage
• Halogen-equivalent wattage

When I say 120W and the supplier hears 120W panel input, the result is a very different fixture. The only reliable way to compare is to ask for the photometric test report and the expected lumens. DesignLights Consortium SSL requirements (DLC, 2025) expect photometric performance to be verified under LM-79/LM-80 test procedures. It's a useful baseline: if a solar lighting manufacturer won't share test data, that's a red flag.

What I should have written in the PO:

• LED wattage and solar panel wattage separately
• Minimum initial lumens
• Battery capacity in watt-hours
• Beam angle or photometric file

That list looks basic now. It wasn't basic to me in 2021, and I paid about $7,400 to learn it. Actually, $7,400 plus a week of labor. For a while I misremembered the cost as only $6k, but the invoice didn't lie.

Mistake #3: Treating sports lighting specifications as an afterthought

Sports lighting is not just big flood lighting. I learned this on a 14-fixture community basketball court. The fixtures were bright, but the uniformity was terrible. One end of the court was okay; the other end looked like dusk. Players complained, and I had to re-specc the whole system.

Meaningful sports lighting specifications usually include:

• Average illuminance (lux)
• Uniformity ratio (average to minimum)
• Glare rating
• Mounting height and aiming angle
• Flicker, if cameras are involved

If you're working with a solar supplier, ask for photometric files (.ies or .ldt). A good manufacturer will provide them. Sunna Design lighting products, for example, are engineered around solar. But whether you're evaluating Sunna Design solar lighting or any other brand, you should see the distribution pattern before you buy.

That mistake cost me an $8,900 redo and a three-week delay. That's when I started asking for sports lighting specifications as a separate document, not a line item in an email.

The checklist that would have saved me $46,000

After the third rejection in Q1 2024, I created a formal pre-order checklist. It's not complicated. It's the stuff I believed I was doing but wasn't.

1. Write the exact product code, not just a category. If the code is unclear, ask for a drawing.
2. Get the datasheet and test method in the same email. A spec without a test method is marketing.
3. Define OEM vs private label in writing. One sentence: custom OEM, product to be built per our spec.
4. Specify lumens, not only watts. Include separate numbers for LED draw, panel wattage, and battery capacity.
5. Request the photometric file before you approve any outdoor lighting layout.
6. Ask about battery chemistry and temperature derating. Solar batteries act differently in hot and cold climates.
7. Put warranty and delivery terms on paper. A verbal promise isn't worth the invoice it's printed on.

In the last 18 months, this checklist has caught 47 potential errors. These are errors that would have become problems after installation. Most were caught at the quote stage, before any money moved.

I want to pause for the smaller buyer. I know what it's like to be the one ordering 20 units, not 2,000. The best supplier relationship I have started with a 14-unit order. They answered questions, sent photometric files, and didn't make me feel like a nuisance. That same supplier now gets my multi-pallet orders. Small doesn't mean unimportant—it means potential.

When you can ignore this checklist

This is procurement advice, not engineering advice. If you're lighting a broadcast sports venue, a highway, or anything safety-critical, hire a qualified engineer. And if you're buying a single fixture for a garage, the full checklist is overkill—but asking for a datasheet is still reasonable.

Also, don't take my checklist as a replacement for local codes. Verify current regulations with your local authority. And one more thing: I have mixed feelings about private label. On one hand, it's how many small brands get started. On the other, if the product fails, your brand takes the hit. If you go private label, run a pilot order before mass stocking.

Now go check your last spec sheet. If this helps you avoid one mistake, I'm glad.