The Hidden Trap in Through-Hole LED Digit Board Quotations: Same Nominal Height, Actual Cost May Differ by Over 20%

In the fields of sports equipment, industrial displays, and outdoor scoreboards, through-hole LED digit boards are widely favored for their high brightness and long lifespan. However, recent market feedback reveals that many customers focus only on the "nominal height" of the digit board when purchasing scoreboards, overlooking a critical cost trap in the industry—the confusion between "PCB overall height" and "effective light-emitting area height."

A real case from a customer in Albania highlights this issue. After reviewing our digit board samples, the customer provided the actual physical board they had previously received from another supplier. Only then did they suddenly realize the problem: although both boards were labeled with the same nominal height, the light-emitting area of the competitor's board was visibly smaller, and the number of LED lamps was significantly fewer. This real-life comparison made the hidden cost difference immediately clear.

Currently, common nominal heights for through-hole LED digit boards include 6 inches, 8 inches, 10 inches, 12 inches, 16 inches, 20 inches, and others. But it is important to note: different manufacturers define "height" differently.

• Some manufacturers refer to height as the overall height of the PCB board (FR4 material).
  Since the LED lamps need to be placed at a certain distance from the edge of the PCB for installation (e.g., 0.5–1 inch edge clearance), the actual light-emitting area (i.e., the height from lamp center to lamp center) is often significantly smaller than the nominal value.

• Our company, however, defines height as the actual light-emitting height from lamp center to lamp center on the digit board.
  This means that, for the same nominal "10-inch" height, the latter requires more rows of lamps, a larger PCB board, and significantly more FR4 substrate material and total lamp count.

Take a 10-inch digit board as an example:

• If height is measured by the overall PCB height, the actual light-emitting height may be only 8–9 inches;

• If height is measured from lamp center to lamp center, the light-emitting height is exactly 10 inches, requiring an average of 10%–15% more lamps and 5%–10% more PCB board area, along with increased labor costs for soldering and inspection.

Therefore, for the same nominal height, products quoted based on "light-emitting height" are typically 15%–20% higher in actual cost. This not only affects the final quotation but also directly determines the display quality, viewing distance, and durability of the scoreboard.

Suggestions for buyers:

1. Clarify the definition of height: When requesting a quote, always ask the manufacturer to specify whether "height" refers to the PCB board height or the light-emitting area height (lamp center to lamp center).

2. Compare the number of lamps: Request the lamp matrix specifications (e.g., number of rows * columns) for the same nominal height to quickly determine whether the height has been reduced.

3. Avoid falling for low prices: Simply comparing quoted prices can easily lead to falling into the trap of "size mislabeling." Instead, comprehensively evaluate the actual size of the light-emitting area, brightness uniformity, and material usage.

As a professional supplier of through-hole LED digit boards, we adhere to the principle of transparent quoting: all dimensions are based on the actual light-emitting height from lamp center to lamp center, and we provide PCB drawings and lamp layout diagrams to ensure our customers purchase with confidence and clarity.

For a standard lamp quantity comparison table for each inch specification and a quotation, please contact us to obtain detailed technical documentation.