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If you build vehicle products for OEMs and the aftermarket, you've probably seen this go the wrong way. A product line grows one version at a time. Engineering adds a heated lens, a second connector, a new finish or a version for another vehicle, and each change makes sense on its own. Over time the line starts to look like it came from several different companies. The fleet manager who was happy with the first light can't find the next one, and a dealer can't point to the shelf and say it's the same maker. The customer you already won has to start the search over, and every competitor gets another chance at the sale.
Over thirty years of designing products for manufacturers, my team has come back to the same idea again and again. A customer who liked the first product should recognize your brand on the next one. That happens when every product and every version shares one design language.
WHAT A DESIGN LANGUAGE IS
A design language is the set of shapes, details, materials and finishes that repeat from one of your products to the next. It covers the way a frame meets a lens, the treatment of an edge, the size and placement of a logo plate, and the finishes a customer learns to expect. When it's done well, a buyer can tell which company made a product before reading the label.
Design researchers treat that kind of recognition as a business advantage. A paper in the International Journal of Design describes visual recognition of a brand's products as a central competitive factor for the companies that make them [1]. Recognition like that is built on purpose. It comes from decisions made once, at the start, and then applied every time a new product or a new version is designed.
WHY THE SECOND SALE IS WORTH SO MUCH
The returning customer is the most valuable customer you have. Research by Frederick Reichheld of Bain & Company found that raising customer retention by 5% raises profits by 25% to 95% [2]. A customer who comes back costs less to win, already trusts the product, and often buys more of the line.
In vehicle products, recognition is also how a supplier becomes the one buyers ask for by name. Mopar's affiliated accessories program sells more than 1,000 aftermarket products through Chrysler, Dodge, Jeep and Ram dealers, and it describes the more than 40 suppliers behind them as its "most trusted and popular" [3]. A supplier earns a place on a list like that when buyers can tell its products from the others and come back for more of them.
RECOGNITION ALSO PROTECTS THE PRODUCT
Products that sell get copied. A SEMA podcast with two hot rod parts makers described knockoffs on eBay and Amazon that use "stolen part numbers, photos, or 'equivalent to' phrasing" to show up in searches [4]. A copy like that works best when the original looks like everything else in its category.
A product with a distinctive design is harder to pass off as equivalent, and the design itself can be protected. An aftermarket lighting maker recently won a key ruling for its design patent on an LED lamp bezel. The court pointed to the bezel's flat outer edges, beveled corners and recessed centers, details that earlier designs lacked [5]. The details that help a customer find you again are the same details that help you defend the product in court.
WHERE A PRODUCT LINE LOSES ITS FAMILY RESEMBLANCE
Most product lines don't lose their identity in one decision. They lose it one version at a time.
A headlight might be sold in low beam and high beam, with and without a heater, and with a black or a chrome bezel. A work light might ship with two different connectors and carry two different brands. A family of lamps might grow from one function per lamp to several functions in one. Each of those versions brings its own engineering demands, and each one is a chance for the outside of the product to drift. A heater needs a cut in the bezel. A different connector changes the back of the housing. Another company's logo needs room on the front.
When industrial design is part of each of those decisions, the versions stay one family. When nobody owns the outside of the product, the line slowly turns into a collection of products that happen to share a catalog page.
ONE DESIGN LANGUAGE ACROSS FOUR MARKETS
JW Speaker, the family-run lighting manufacturer in Germantown, Wisconsin, has brought my team into four of the vehicle markets it sells into. After the first of those projects, a headlight for Victory motorcycles, JW Speaker's project engineer wrote to us: “Moving forward we want to set up a family look to all the forward lighting...” The projects that followed were designed to carry that family resemblance from one product, and one version, to the next.
HEAVY TRUCKS: ONE FACE ACROSS EIGHT VERSIONS
JW Speaker's Model 8800 is a 4x6 LED headlight for heavy trucks. It's sold in eight versions: low beam and high beam, heated and non-heated, with a black or a chrome bezel [6]. We designed a new face for the 8800 and carried it through every one of those versions. The heated versions needed a cut in the bezel for JW Speaker's heating element, with its own limits on wall thickness, so we modeled the heated bezels from the heater shapes JW Speaker's engineers sent and kept the face exactly the same. A buyer who knows one 8800 recognizes the other seven, on the truck, in the catalog and at the dealer.
POWERSPORTS: A BEZEL THAT CARRIED INTO THE NEXT MODEL
For JW Speaker's adaptive headlight for Victory motorcycles, we designed the bezel around optics, a housing and a lens that JW Speaker's engineers had already built. Each set of optics got its own sculpted frame, so the way the headlight lights a turn shows in its shape. When JW Speaker updated the headlight as the Adaptive 2, it kept the same bezel, offered with a black or a chrome inner bezel [7]. A rider who knew the first version recognizes the second.
MATERIAL HANDLING: A SHAPE THAT SAYS JW SPEAKER, WHATEVER THE LOGO
JW Speaker's Model 710 work light for forklifts and warehouse vehicles was designed to carry two brands, the forklift maker's and JW Speaker's own. That meant the shape itself had to say JW Speaker, whichever logo sat on the plate. We built the brand into the top of the housing with faceted panels and two chevron-shaped pads around a center logo plate. We modeled the top as one continuous set of curved surfaces, so the plate looks like part of the design. The Model 710 ships with that top today [8].
AGRICULTURAL AND OFF-HIGHWAY EQUIPMENT: A FORM AND A MOUNT MEANT TO CARRY OVER
JW Speaker asked us for concepts for a new 90mm lamp that combined two of its existing lamps in one product, with a mount that could carry over to other new lamps. We designed the form and the mount so other products in the family could share them. JW Speaker later released its own five-in-one 90mm headlight, the Model 93, with a finned die-cast housing and single and double pedestal mounts [9]. At the review meeting for our concepts, JW Speaker brought two more projects to the table.
Across those projects JW Speaker kept bringing my team back. That may be the plainest sign that a design language works: the customer you build it for comes back, too.
A CHECK YOU CAN RUN THIS WEEK
Pull one of each product in your line, every version and every finish, and set them side by side on a table. Then ask someone who doesn't work for you, a dealer or a customer, which ones they think came from the same company.
The products they group together are your design language. The ones they set apart are where your line has drifted, and those are the places to start. The next version of any of them is the chance to bring it back into the family, because a design language is decided once and then pays back on every product after it.
The second sale is decided earlier than most people expect. It's won while the first product is still being designed, because the choices made on that first face, housing or bezel decide whether the next product can look like part of the same family.
SEE IT IN YOUR MARKET
You can see how this worked in each market in our case studies: heavy trucks, powersports, material handling and agricultural equipment. If you're planning a new product or adding versions to a line, let's set a 30-minute call to walk through your product line and the next product in it.
Jon Levy, CEO, KAIA
REFERENCES
- Toni-Matti Karjalainen, "It Looks Like a Toyota: Educational Approaches to Designing for Visual Brand Recognition," International Journal of Design, 2007. https://ijdesign.org/index.php/IJDesign/article/view/43/14
- Amy Gallo, "The Value of Keeping the Right Customers," Harvard Business Review, October 29, 2014, citing Frederick Reichheld of Bain & Company. https://hbr.org/2014/10/the-value-of-keeping-the-right-customers
- THE SHOP, "Mopar Expands Offerings With New Affiliated Accessories Program," July 15, 2025. https://theshopmag.com/news/mopar-new-affiliated-accessories-program/
- SEMA Hot Rod Industry Alliance, "Fake Parts, Real Problems: Manufacturers Fight Fake Hot Rod Parts on Hammer Down!" podcast episode description, February 12, 2026. https://podcast.show/3714310/episode/152220890
- Deirdre M. Wells, Sterne Kessler, "Design Patents Year in Review: District Court Decisions," January 30, 2026. https://www.sternekessler.com/news-insights/insights/design-patents-year-in-review-district-court-decisions-design-patent-highlights/
- Raney's, "JW Speaker 4" x 6" LED Evolution 2 Projection Headlight Model 8800." https://www.raneystruckparts.com/jw-speaker-4-x-6-led-evolution-2-projection-headlight-model-8800
- JW Speaker, "Adaptive 2 Motorcycle Headlights" (brochure pages), May 2, 2018. https://www.jwspeaker.com/wp-content/uploads/05-02-2018-JW-Speaker-Adaptive-2-Motorcycle-Brochure-Pages.pdf
- JW Speaker, "Warehouse LED Work Light, Model 710." https://www.jwspeaker.com/products/forklift-work-light-model-710/
- JW Speaker, "90mm LED Headlight, Model 93." https://www.jwspeaker.com/products/90mm-headlights-model-93/
