Out on the fab floor, you know how it goes: a soft bake that drifts even two degrees can throw critical dimensions off and turn a whole lot into scrap. Temperature uniformity across the wafer isn’t a “nice-to-have.” It’s a hard requirement. TEL heater lamps give lithography cells the thermal control they need, cycle after cycle. What matters under the hood We build the lamp around short-wave infrared emission and a quartz-halogen design, tuned to dump heat into photoresist and substrate fast—and repeatably. Across the bake surface, wafer-level uniformity holds at ±0.1°C, and setpoint repeatability lands in the millisecond range. The system drops into Class 1–100 cleanrooms without hiking particle counts; zero particle generation is verified by in-line monitoring during qualification. Power stays stable from startup through 5,000+ hours, with output drift held under 5% under continuous duty. Why this matters in photoresist processing Soft bake and hard bake set line width, profile, and adhesion. TEL heater lamps lock down the thermal budget, so you can run tighter control limits and cut down on excursions. The payoff is higher yield per lot and less rework driven by bake nonuniformity. Energy use falls because the lamp hits temperature quickly and holds it without much overshoot, and the long service interval keeps scheduled downtime off the calendar. You widen the process window without sacrificing throughput. Here’s what to watch for The lamp only hits spec when it’s matched to the tool’s voltage, connector interface, and optical path geometry. Keep replacement alignment tight and the quartz clean—misalignment or fingerprints on the quartz will chew into uniformity. Line up the swap with your preventive maintenance window, and verify temperature profiles after every installation to keep the process nailed down.