We built this portable industrial heater for engineers who need serious heat in a small package. It’s a 2500W, 400V halogen tube, 300mm long, wired straight for a direct R7s connection. Here’s the thinking behind the numbers. We set it at 2500W and 400V on purpose. Higher voltage means lower current for the same power, so you can run thinner cables and keep voltage drop in check. The 300mm length? That gives you a tight, focused hot zone without wasting space. And it heats up fast. Not warm-and-slow. Just fast. Inside, the halogen element sits in a quartz envelope, throwing shortwave infrared radiation exactly where you aim it. The quartz coating handles thermal shock, so output stays steady even as the tube cycles on and off. The R7s base is simple—two pins—so it drops right in as a replacement. Wire it up, clamp it down, and it stays put. Use it wherever you need intense, localized heat: plastic heating zones, curing lines, portable process setups. The high heat density gives you quick response, but it also means you need proper cooling and clearance. Keep air moving over the fixture and give it some space. This setup gives you industrial-grade heat that’s easy to specify, easy to install, and easy to replace.