We built this 400V halogen heater for engineers who need serious heat in a small space—without the headache of rewiring the whole machine. The core is simple: 2500W at 400V, packed into a 300mm quartz tube. That gives you a lot of heat in a tight footprint, so you can bring small zones up to temperature fast. Power, voltage, and size—why it matters Running 2500W at 400V means lower current than lower-voltage heaters. In practice, that translates to thinner wiring, smaller terminals, and less voltage drop over longer runs. The 300mm length keeps the footprint small, so it slips into spots where longer elements just won’t fit. You get quick thermal response—this element hits target temps fast. Just know it concentrates the heat. Plan your enclosure and cooling path to handle that localized energy. What’s inside: halogen, quartz, and the R7s base The halogen cycle keeps the quartz envelope stable even when the filament runs hot, so output stays consistent over time. The quartz tube handles thermal shock well and stays clear, which keeps radiant heat predictable. And the R7s base? Practical choice. It locks in securely, carries the load reliably, and makes mounting straightforward and repeatable. This is a drop-in element for standard R7s fixtures. Where it shines: direct, controllable heat Use this wherever you need intense, controllable radiant heat—spot heating, process preheating, drying a small area. The high watt density gives you a fast heat-up, and the 400V/2500W spec keeps electrical demands manageable. Just match your control method to the load: a properly sized contactor or solid-state relay, plus solid over-temperature protection.