Almost all the reasons for failure of cold storage lighting have nothing to do with the LEDs themselves. Semiconductor devices generally prefer low temperatures; the real problems are the drive power supply, seals and condensation.

The electrolytic capacitor in a conventional driving power supply will degrade as the temperature decreases, and the equivalent series resistance will increase. By −25 °C, this effect is so serious that some drivers cannot start reliably, or can start but cannot output the rated current. A pragmatic solution is to choose a driver with a clearly marked operating temperature range, or to adopt a design that leaves the driver outside the refrigerated environment. Please request a written rated ambient temperature range and do not accept general labels such as "−20 °C to +40 °C" that have never been measured at the low temperature end.

Condensation is the second failure path. Every time I open the door, hot and humid air enters, and water condenses on surfaces below the dew point. Water adheres to the housing, flows to the lowest point, and accumulates next to the sealing ring if the structure of the lamp allows it. The IP65/IP66 fully enclosed housing with sealing rings, equipped with silicone sealing rings, is much better than the louvered or ventilated design; the surface of the housing is smooth and does not absorb water, and water can be drained rather than retained.

Material selection is the last piece of the puzzle. Ordinary polycarbonate becomes brittle under long-term sub-zero conditions; stainless steel or coated aluminum clips perform much better than painted carbon steel during freeze-thaw and washing cycles.