TUBA W is a wall lamp with a cylindrical metal body finished in matt white. The cylinder is open at the top and at the bottom and meets a square plate at the side, which is what screws to the wall. The G9 lampholder is visible inside, near the lower rim.
How big it is and how much wall it takes
The body measures 8 cm across and 10 cm high, and the manufacturer gives a depth of 10 cm — that is how far the lamp and its bracket stand out from the wall. Compare that figure with the width of the passage the lamp is going into: in a narrow hallway it decides whether you walk past it comfortably.
At 300 g the lamp puts almost no load on the wall, so the mounting position is settled by where the supply cable runs rather than by what the wall can carry. It runs on 230 V straight from the house wiring.
What light source it takes
The lampholder is a G9 and accepts a source of up to 5 W. No bulb is supplied, so you choose the colour and the brightness yourself — for a hallway or a bedroom most people pick 2700–3000 K, a warm, slightly yellow light.
The manufacturer allows dimming, but only with a source explicitly described as dimmable — that is decided by the bulb rather than by the fitting, and a dimmer in the circuit is needed as well.
How it spreads the light
The metal cylinder is opaque and open only at its two ends, so the light leaves in two beams: up along the wall and down. The lamp draws two bright patches on the wall instead of lighting the whole room — it is there for local light, not as a replacement for a ceiling fitting.
Where the manufacturer places it
Rendl points TUBA W at entrance areas, corridors and other passage spaces in the house, and in the catalogue it also comes up under staircase, living-room and bedroom lighting. The form is minimal: a smooth cylinder with no ornament, a single matt white and no visible hardware apart from the square mounting plate.
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