Out on the blow molding floor, an old lamp doesn’t fail with a bang. It fades. You start seeing slower cycles, heavier wall thickness, and more scrap piling up. Then the maintenance tickets follow: emergency callouts, parts that don’t quite match, and a heating tunnel that never settles. On SIG Blomax 4/6/8/10 lines, that instability hits right where it matters—throughput and bottle-to-bottle consistency. What matters under the hood We built this replacement as a direct-fit infrared emitter for SIG Blomax 4/6/8/10 heating tunnels. Quartz envelope, tuned filament—short-wave output that’s predictable, so preform skin heats quickly without scorching. The geometry is a straight match: same overall length, same R7s connector interface, same mounting footprint. Electrically, it’s specced to the machine’s standard voltage and power draw, so the control profile you’re already running stays put. No re-tuning the PID. No second-guessing watt density. Why this plays in stretch blow molding The heating window is tight in stretch blow molding. Let lamp output drift, and you’re chasing it down the line—longer dwell, higher pressure, more rejects. This emitter stabilizes the tunnel profile, which helps you hold wall thickness and cut back on flash and stress marks. The payoff is fewer unplanned stops and a process that repeats, shift after shift. In real life, teams see fewer lamp changes over a production year, less spare inventory, and less downtime spent swapping parts. Energy stays in line because the emitter matches the machine’s designed thermal load. A few shop-floor notes Installation is straightforward, but the tunnel is tight. Handle the quartz tube by the metal base, not the glass, and double-check reflector alignment once it’s seated. The lamp is engineered for SIG Blomax 4/6/8/10 compatibility, but verify your machine’s exact voltage and the condition of the connector—older units can have wiring differences that affect seating and contact resistance. After the first change, run a temperature scan to confirm your setpoints are still hitting the mark.