Under-Desk Halogen Heater: 400V, 2500W Power, R7s Base, and a 300mm Quartz Tube for Compact Industrial Heat
We built this under-desk heater for engineers who need serious heat in a tight spot—without hauling in a giant industrial unit. It’s a shortwave halogen lamp, built around a 300mm quartz tube. It delivers 2500W at 400V, and it uses an R7s base. In other words: it’s a small package that throws a lot of warmth, right where you need it.
Power, voltage, and size—kept simple
This heater is rated at 400V and 2500W because that’s what it takes to pack serious heat into a 300mm tube. That power density is the secret behind the fast warm-up. It also helps you hold a stable temperature in tight, confined spaces. Just match the supply to 400V, and you get the intended current draw. Use the wrong voltage, and you’ll either end up with weak heat or push the element too hard. And the 300mm length? That’s the whole point. It keeps the footprint small enough to slip under machinery hoods, run along narrow conveyor sections, or fit inside compact enclosures.
What it’s made of—and why it matters
The quartz tube is built to handle rapid heating and cooling without flinching. It runs hot enough to keep the halogen cycle doing its job. And that halogen cycle helps the element hold steady temperature over time—so the output stays consistent as the lamp ages. Installation is straightforward, too. The R7s base is an industry-standard connector, so it’s a drop-in swap on compatible fixtures. Line up the pins, seat the tube, and lock it in. Done.
Where it shines—and what to keep in mind
This setup is for close-proximity heating where space is tight and response time matters. Think under-desk or under-panel heat, small drying zones, and localized warm-up stations. You get heat fast. The form is compact. And when the lamp needs replacing, the swap is easy. Just keep one thing in mind: 2500W is dense power. Make sure there’s proper airflow and a little breathing room around it, so nearby components don’t get cooked.