Sunna Design Solar Lighting: Flood Light Distributor Buying Guide

I took over purchasing in 2020 for a 40-person distribution company. I manage product orders and vendor relationships and report to both operations and finance. During our 2024 vendor consolidation project, we cut the lighting supplier list from 12 vendors to 8. Solar flood lights were the hardest category. Flood light private label was not a packaging exercise. It required the same evidence as buying for a customer's project, maybe more.

This flood light distributor buying guide is the checklist I use when evaluating solar lighting suppliers. It is not a generic ask-for-three-quotes article. It is the operational path I follow before adding a solar flood light to a catalog. If you are a dealer, wholesaler, procurement manager, or contractor looking at manufacturers like Sunna Design, use this as your template.

Who Should Use This Checklist?

Use this checklist if you are deciding whether to stock a solar flood light line, if your customer needs a product that will survive cloudy weather, or if you are evaluating flood light private label. There are seven steps. The order matters. Step 2 and Step 4 are the two that most teams skip.

Step 1: Define the Operating Profile Before You Compare Watts

My first mistake was comparing solar flood lights by wattage. A 50-watt LED with a narrow optic can outperform an 80-watt fixture with a wide distribution in the exact same location. The product should be selected by operating profile: mounting height, distance to the target area, beam angle, required lux, hours after sunset, number of poor-weather days, and charging conditions at the site.

It is tempting to think of a solar flood light as three separate parts: panel, battery, and LED. Performance, however, comes from the interface between them. A larger panel is useless if the controller cannot use it. A bigger battery is not worth the freight if the light load exceeds what the panel can recharge in mid-winter. Write the profile down before you request a quote.

Step 2: Make Photometric Data a Condition of the Quote

The question everyone asks is lumens. The question I ask first is whether the supplier can provide an IES file and an LM-79 report for the exact flood light they are quoting. LM-79 is the approved IES test method for measuring optical and electrical characteristics of LED luminaires. LM-80 and TM-21 address LED package lifetime. If a supplier cannot provide IES files, do not assume the product is bad. Assume only that you cannot verify it, and verify with samples instead.

One more warning: the file must match the SKU. I have seen files sent from a larger model and then used to support a smaller fixture. The difference is not always huge, but a distributor buys inventory, not trust. Ask the supplier to include the model number in the photometric file name, and keep that file in your product record.

Step 3: Ask What Private Label Actually Includes

If your business model depends on flood light private label, start with the definition of scope. Where does the logo go? Is it printed on a sticker, engraved, or cast into the housing? Who selects housing color? Who designs the packaging and barcode? Who is listed as the importer or responsible party on the label and declaration of conformity? These details determine whether the private label project is profitable or just a sticker exercise.

I went back and forth between an established manufacturer's brand and our own private label for two weeks. The established brand had shorter lead times. Private label gave us margin and control over the presentation to our customers. We chose private label because our dealers wanted a consistent product identity. The surprise was not the logo work; it was the compliance paperwork. That part took twice as long as the artwork.

Step 4: Test the Sample for Cycles, Not for One Night

Parking-lot testing is fine for a wow moment. It is not enough for a purchase decision. In 2024, we tested three samples on the same roof with the same weather. One stayed on through four overcast days. The other two stopped on night three. That was the moment sample testing became non-negotiable.

Keep every sample for at least seven days. Fully discharge it, then recharge it under normal conditions. Simulate poor weather by covering the panel for a day or by limiting charging time. Watch what happens when voltage drops: a well-designed light dims or uses a schedule; a poorly matched one just switches off. Also ask whether the fixture can run from dusk to dawn, or only for a few hours at full power. If the supplier says dusk-to-dawn but the sample dies before 2 a.m., the configuration is wrong.

Step 5: Inspect Battery and Controller Specifications

The LED board is not the first failure point in a solar flood light. The battery and charge controller are. Ask for written specifications before you commit. What battery chemistry is used? What is the rated capacity in watt-hours? What is the operating temperature range? Is the battery pack replaceable? If it is glued or molded into the housing, every warranty call becomes a return of the whole fixture.

I also want to understand the controller. It handles charging, low-voltage disconnect, dimming schedule, and fault detection. A basic PWM controller is acceptable for many small flood lights; MPPT adds cost and makes sense on larger solar systems. What matters is behavior: Does the controller protect the battery from deep discharge? Does it store event data? The more data the controller records, the easier it is to diagnose a field claim.

Step 6: Put Freight, Customs, and Dangerous Goods in Every Quote

This is the unglamorous step. A solar flood light with a lithium battery can be regulated for transport. Depending on configuration and battery size, it may be shipped under UN3481, which means lithium ion batteries in or with equipment. Replacement battery packs shipped separately have their own rules. If your supplier sends a quote that ignores this, the cost discrepancy will show up after you place the order.

Ask for Incoterms and confirm which party is responsible for freight from origin to your warehouse. Ask whether samples are sent by courier under full dangerous goods paperwork. Ask if bulk orders can go by sea without a separate battery certificate. These questions separate suppliers who ship solar lights regularly from companies that only assemble them.

Step 7: Define the Warranty Process Before the First PO

Five-year warranty is a phrase. It does not tell you what happens when a customer calls. The useful questions are: Does the warranty start at invoice date or installation date? Is there an advanced replacement? Does the customer ship back the whole fixture or only the controller? Does the supplier stock spare parts after the product is discontinued? Who handles disposal of a damaged lithium battery? A supplier with a real process can answer these in writing.

I have approved a purchase order partly because the warranty process was clear, even when the price was slightly higher. The cost of one failed flood light is not the fixture. It is the trip to the site, the negative reference, and the time your own team spends chasing an answer. Warranties are not marketing; they are logistics.

Where Sunna Design Fits In

Sunna Design lighting is relevant to this guide because the product range covers solar flood lights, area lights, street lights, wall lights, and OEM/private label support. In other words, it is the kind of manufacturer a distributor should put on the evaluation list. But no range and no brand story replaces the evidence checklist above. If you are reviewing Sunna Design solar lighting for a flood line, request the IES file, LM-79 report, battery specifications, OEM/private label terms, and warranty process for the exact SKU you plan to order.

This flood light distributor buying guide will not make you an expert in photometry. It is designed to keep you from approving a product based on a brochure. The supplier that can answer with documents and test data reduces your risk. The supplier that cannot answer may still have a good product, but it is not yet ready for a distributor's catalog.