On a tempering line, the preheat stage is where the day’s output—and scrap—gets set. When the Punti rod preheater lamp starts to underperform, the furnace ends up chasing temperature. Energy spikes, and the glass hits the furnace with uneven heat across the sheet. The payoff is thermal stress fractures and rework you can’t afford. We built the Punti rod preheater lamp to stop that drift right at the entry point, where it starts. What matters, technically It’s short-wave infrared in a quartz envelope, tuned for fast, directional heating. Energy hits the rod and the glass surface without dumping heat into the surrounding air, so convection losses drop. The thermal field stays focused, which keeps hot spots from forming and holds the glass edge-to-edge within a tight temperature band. It’s designed to match standard voltages, with terminals and brackets that make it a drop-in replacement. The response is quick—seconds, not minutes—so line speed doesn’t get thrown off when glass thickness changes. Why it plays well in a real plant You see the gains in the places that hit the P&L every day: energy, yield, and downtime. Energy use falls because the lamp heats the target directly instead of the whole environment. Finished glass comes through more consistently, so first-pass yield climbs and you stop re-templing so much. Maintenance intervals stretch out, too—quartz handles thermal shock, and the housing runs cooler, which cuts wear on surrounding parts. The payback shows up in kilowatt-hours and fewer rejected sheets. What to watch on install It’s straightforward, but alignment is the make-or-break. Set the lamp so the distance and angle stay uniform across the glass width; if you don’t, temperature variance creeps back in. Check that the existing power supply and control match the lamp’s rated load, and confirm clearances so you don’t get shadowing at the edges. When it’s set right, the preheat zone stays predictable—so the furnace can focus on tempering, not correction.