On a PET line, the heating tunnel is where you make or break uptime. One lamp starts drifting on output, and suddenly you’re chasing thin walls, haze, and inconsistent stretch. You need a spare that matches the OEM’s electrical and thermal profile—exactly. What matters, technically This infrared lamp is rated 440V, 2500W, built for the high-current demands of blow molding heaters. The quartz envelope and halogen/IR filament put out short-wave energy that gets into PET fast, so preforms hit temperature in a shorter dwell. That tightens the thermal window across the heating zone and helps keep cycle-to-cycle repeatability steady. We match the power and voltage to the blow molder’s heater circuit so you don’t under-heat the preforms or overload the busbar and control gear. Why it holds up in stretch blow molding In stretch blow molding, the preform has to be heated uniformly before it hits the mold. With this lamp, the tunnel holds target temperature with less swing, which cuts scrap from brittle necks and weak shoulders. In practice, that means fewer line stops chasing temperature drift and more consistent bottle weight. Energy use is also more predictable: at 2500W, the emitter heats fast and recovers quickly after door cycles, so you spend less time waiting and more time blowing. Here are the practical details Check the lamp length and base type—usually R7s—against your holder and reflector. The 440V rating is for specific machine configurations; if your line runs a different voltage, pick the correct variant or you’ll get premature failure. The quartz envelope is sensitive to contamination. Keep the reflector clean and don’t touch the tube; oils create hot spots and shorten life. Install with the specified torque and alignment so contact stays solid and heating stays even.