مصباح طاولة من الزجاج المقسى الشفاف Iris™

Most bedside lamps get one of two things wrong. Either the shade is so thin that the bulb shows through as a bright spot visible from the pillow, or it is so opaque that all the light goes to the ceiling and you still cannot read. Opal glass is the old answer to that problem: a solid dome that turns one bulb into an even, low, honey-coloured pool.

Opal glass is neither frosted glass nor white plastic. The white is inside the material, a milky layer fused between two clear ones, so light does not bounce off a surface coating; it passes through the wall of the dome and comes out already softened. That is why there is no hot spot, no visible filament and no hard edge where the light ends. With a warm 2700K bulb the whole dome glows at about the brightness of a candle held close.

Below the dome, the column is chrome-plated steel over a clear sleeve, and the base is a 12 mm disc of tempered glass with its green cut edge left visible. The weight matters more than you might expect: at 3.8 kg the large lamp slides and does not topple when your foot catches the cable, and with the centre of gravity so low a duvet dragged past will not pull it to the floor. The switch is a ball chain at the neck, with no app, no touch sensor to fail and no standby light glowing in the dark.

There are two sizes for two different jobs. The one for the bedside is 18 cm across and 36 cm tall: it stands clear of a stack of books and lights the page without lighting the room. The other, 28 cm across and 47 cm tall, is closer to furniture, for a hallway console, a sideboard or the end of a long desk, and it can hold a corner alone. Both take a standard E27 screw bulb, which is not included, and both come with the plug you choose.

Wipe the dome with a barely damp microfibre cloth and dry it at once. The glass is white all the way through, so it cannot lose its colour, but water spots show on a matte surface. Keep glass cleaner and anything containing ammonia off the chrome, because it pits the plating in time; use a dry cloth on the column. Let the bulb cool before handling the dome. If the ball chain ever feels gritty, one drop of light oil at the neck and a few gentle pulls will free it. Do not force it.

Dome in hand-blown opal glass; column in chrome-plated steel over a clear sleeve; base a 12 mm disc of tempered glass with a polished green cut edge; mechanical ball-chain rotary switch; cable with inline strain relief. Takes one E27 screw bulb, 40 W maximum, not included; the light is designed around a warm 2700K filament or LED bulb. Verified sizes: the small is 18 cm across the dome and 36 cm to the top, and the large is 28 cm across and 47 cm to the top.