Introduction: The Spec-Driven Replacement Bulb
We engineered these 420mm halogen heater replacement bulbs as a direct-fit solution for industrial heating systems where space is tight and heat density is non-negotiable. Rated at 220V and 2500W, the unit targets machines that need fast, focused infrared output without rewiring the entire heater assembly. If you are running a line that demands immediate recovery and stable temperature control, this bulb spec is built around repeatable thermal performance.
Technical Deep-Dive: Power, Voltage, and Physical Dimensions
The 2500W rating is not arbitrary. It is chosen to deliver high watt density over a short length, which is exactly what you need when the heater footprint is constrained by the machine throat or the oven cavity. Running at 220V keeps the current load within a range that many industrial power circuits can handle without major rework, while still delivering the heat output required for rapid heating cycles. The 420mm length is a practical compromise. It is long enough to provide a stable, uniform hot zone, but short enough to fit into compact heater housings. This length also supports consistent filament temperature across the tube, which helps reduce cold spots and the resulting uneven heating on the target. One reality check: 2500W in a compact envelope generates significant heat. The surrounding mounting hardware and reflector must be rated for that thermal load, and the machine ventilation needs to be properly spec’d to keep the lamp and nearby components within safe operating temperatures.
Material & Design: Halogen Chemistry, Quartz Tube, and R7s Connectors
Inside, we use a halogen cycle design to maintain stable output over the life of the bulb. The fill gas and filament work together to reduce evaporation and keep the quartz envelope clearer longer, which matters when you are running long shifts and cannot afford output drop-off. The tube is high-purity quartz. Quartz handles the thermal shock of rapid on/off cycles better than many materials, and it transmits short-wave infrared efficiently. Depending on the exact variant, the tube may use a reflective coating band. That band directs energy forward, so more heat goes where you want it and less is wasted backward into the fixture. The connector is R7s—a double-ended linear pin base that is standard across many industrial infrared heaters. It provides solid contact retention and repeatable alignment, so the bulb seats squarely in the socket. This matters for vibration resistance and for maintaining the intended focal distance in focused-heat applications.
Application & Benefits: Engineer-Focused Performance in Real Machines
This configuration is commonly used as a drop-in replacement in industrial heating equipment that relies on short-wave infrared for speed—think plastic processing, coating lines, and packaging sealing. The 2500W output at 220V gives you the ability to reach setpoint quickly, shortening cycle times and reducing idle heating delays. For maintenance teams, the R7s base means you can swap the bulb without modifying the wiring harness or the lamp holder. The 420mm dimension ensures it fits the existing slot without redesigning the heater block. The trade-off is straightforward. High heat density improves response, but it also demands disciplined thermal management. Pair this bulb with the correct reflector and ensure airflow and mounting surfaces are designed for 2500W operation. When spec’d correctly, it delivers repeatable heat, predictable electrical behavior, and a straightforward replacement path on the plant floor.