Out in the cold chain, UVC disinfection falls apart when lamp output tanks at -20°C. We built sleeves for UV sterilization lamps to keep spectral output steady where standard lamps and quartz assemblies lose intensity—because when output dips, you’re gambling with pathogen control and throughput. Here’s what actually matters under the hood. The sleeve material is UV-grade quartz with a controlled dopant profile, matched to the lamp envelope for low thermal expansion. That keeps stress cracking down when you’re cycling between -20°C and damp ambients. The geometry is tuned to form a reflective cavity that holds peak irradiance across the germicidal band, so 254 nm output stays in tolerance even after repeated thermal shock. We spec ozone-free operation and a coating window that fights frost and condensation, so the lamp starts reliably and holds output over 5,000+ hours with less than 5% drop. Cold-chain facilities don’t need spikes—they need repeatable dose. These sleeves stabilize lamp temperature and arc stability, so you get consistent UVC dose for surface and air disinfection in freezer rooms, reefers, and wash-down bays. The payoff is predictable log reduction, fewer microbial excursions, and less downtime chasing lamp replacements. The fit is straightforward, too: it drops in without rewiring, matching the lamp bases and fixtures already running in cold environments. Before you install, confirm fixture compatibility. Reflector spacing and socket thermal rating have to line up with sleeve length and operating current. Handle with clean gloves—fingerprints create hot spots and accelerate quartz devitrification. Keep an eye on output with a calibrated radiometer at the target plane, and stick to the cleaning schedule so irradiance doesn’t drift. In very high humidity with ice formation, verify your defrost or airflow strategy so the sleeve surface stays clear.