LED 101 / Hardware
Batched modules and calibration
Factory calibration can match odd modules today. Batched LEDs age together, which is what keeps a wall even five years out.
LEDs from the same production batch share nearly the same colour and brightness. Mix batches on one wall and you risk patchy greens, pinkish whites, or a bright stripe where a new module went in.
Factory calibration can pull mismatched modules into line on day one by adjusting drive levels. It cannot rewrite how those modules age. Different lots can dim and drift on different curves. A calibrated spare that looked perfect at install can read as a stain two seasons later.
Serious makers build a wall from one batch and hold matching warranty spares for that job. When a module dies, the replacement comes from the same family of parts. That is dull logistics, and it is what keeps a gym wall looking like one screen instead of a quilt.