On the floor, a UV gallium lamp for PCB exposure doesn’t blow up when it’s going south. It just gets quiet—energy dips below the threshold, and your linewidth and registration start to drift. You don’t catch it until you’re staring at scrap. If you want to keep the process honest, you need regular, quantitative intensity monitoring. No shortcuts. What matters technically A UV gallium lamp for PCB exposure is built around 365 nm output, with a tight spectral spike that lines up with the photoresist photoinitiators. Track peak irradiance at the actinic plane and delivered energy density (mJ/cm²) across the diagonal of the exposure frame. Our lamps hold spectral purity and arc stability, so the 365 nm fraction stays repeatable over the life of the lamp. Pair that with a calibrated UV energy test strip: run a strip through the chamber, read the photochromic response against a known reference, and you get an in-process reading of delivered dose. Why it works in PCB exposure The dose window in PCB exposure is tight. Too little energy and the resist underexposes; too much and you lose fine features. Run a weekly energy test strip and you get a maintenance trigger before output drifts outside spec. With stable 365 nm output and a reflector assembly that keeps uniformity in line, you stretch lamp life, cut rework, and keep the line moving. The result is predictable: fewer dose excursions, consistent linewidth, and less downtime chasing exposure swings. The short version? Installation is straightforward, but thermal management is not optional. Hit the rated airflow and keep the lamp at the specified cold-spot temperature—otherwise, arc stability and spectral output wander. Also check reflector cleanliness and positioning. Dust and misalignment can knock delivered intensity down in a very measurable way. Plan replacements using both operating hours and energy test strip readings, not hours alone. A lamp can still meet 365 nm output while total delivered energy at the board plane falls as the reflector ages.