We built this balcony heater to be a small but mighty spot heater—compact, focused, and seriously effective. It runs on a 300mm halogen tube cranking out 2500W, powered by 400V. That voltage choice keeps the current lower, so the wiring stays simple and you get more heat for every amp. Here’s the thing about the power and size: packing 2500W into a 300mm tube means you get tight, concentrated warmth. The 400V supply cuts down on energy loss in the wiring and keeps the fixture footprint small. This is direct heat, pure and simple—it warms people and surfaces fast, without first fussing with heating the air around them. Just keep in mind: that kind of heat density needs proper clearance and a well-ventilated spot so nothing gets too hot locally. Inside, the quartz envelope takes the high heat in stride and won’t crack under sudden temperature swings. The halogen gas keeps the filament steady, so the output stays consistent over the tube’s life. The coating dials back the glare while letting the infrared warmth through, so you feel the heat without the harsh light. And the R7s connector? It’s a proven industrial fit—easy to wire, holds tight even with vibration, and built for lamp changes again and again. On the balcony, this heater gives you a tough, straightforward heat source that installs quickly and doesn’t need a maze of control wiring. It drops right in where you already have an R7s setup, and the short tube keeps the unit from sticking out. For you, that means steady, predictable warmth, service that’s simple, and a build that can handle whatever the outdoors throws at it.