Gallium lamp for screen print exposure

Sat, 20 Jun 2026 09:02:15 +0800

On the floor, a weak exposure unit doesn’t come in screaming “lamp problem.” You see it in soft edges, pinholes, and rework that keeps eating your uptime. In screen exposure, the gallium lamp is the heart of the operation, and its output is only as clean as the quartz that holds it. What actually matters under the hood We build gallium lamps for screen exposure using 99.99% optical-grade quartz. Drop down to a lower grade and impurities start soaking up UV photons and turning them into heat. That shifts the spectral output and drags down peak irradiance at the wavelengths that really drive photoinitiator activation. With 99.99% purity, the lamp holds a stable spectrum around 365–405 nm, so energy density across the exposure plane stays consistent. You get stable irradiance at the stencil, exposure times you can count on, and dot reproduction that repeats job after job. The lamp geometry and reflector alignment are set to keep dose uniformity inside tight tolerance—so the stencil cures edge to edge without hot spots. Why this matters in screen exposure You don’t need brute power—you need repeatable cross-linking. A stable spectrum means fewer exposure recalibrations, less trial-and-error, and fewer rejects from under-cured emulsion. It also widens the process window enough to absorb small swings in emulsion thickness and lamp aging. Energy use goes down because the system isn’t constantly chasing output drift. Lamp life stretches too, because the quartz resists solarization and holds its transmittance, so the spectral curve doesn’t wander as the hours pile up. Here are the practical details that bite you if you ignore them Match the lamp to your frame size and reflector geometry. Output is only as uniform as the optics that contain it. Check your fixture voltage and ignition method—gallium lamps have ballast and starter requirements that don’t line up with standard mercury vapor systems. Keep the lamp surface clean. Fingerprints and coating residues scatter UV and throw exposure off. And temperature matters: enough airflow prevents thermal droop and keeps the quartz envelope from taking on thermal stress.

Exposure on UV Curing Power

Gallium lamp for screen print exposure