Lava lamps are mood lights first and lamps second. A bulb in the base warms coloured wax in a glass bottle of liquid until it rises, cools and sinks again in slow blobs. They give a soft light that suits a bedroom, a shelf or the corner of a gaming setup, and they reward a little patience.
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Buying guide
The lava lamp was invented in Britain by Edward Craven Walker in the early 1960s, and the basic idea has barely changed since. The appeal is the movement as much as the light.
The bulb heats the wax at the bottom of the bottle. As it warms, the wax becomes slightly less dense than the surrounding liquid and rises; at the top it cools, becomes denser and sinks back. That cycle repeats for as long as the lamp is on. The bulb is part of the mechanism, so always replace it with the exact type and wattage printed on the base.
A new lava lamp can take several hours to flow properly the first few times, while the wax settles. After that, most need between 45 minutes and two hours, depending on size and the temperature of the room. In a cold bedroom in winter they take longer, and a draught or a window can stop the flow altogether. Avoid shaking the lamp to speed things up, as it can turn the liquid cloudy.
Classic lava lamps stand around 35 to 45 cm tall; larger ones take longer to warm and give off more heat. Place a lava lamp on a flat, stable surface out of direct sunlight, away from radiators and out of reach of small children and pets, since the glass and base get hot. On a desk, keep it to one side of the screen rather than behind it, so the movement catches your eye without competing with the game.
Most makers advise running a lava lamp for no more than eight to ten hours at a time, then letting it cool fully before the next use. Leaving it on all night can overheat the wax, which then breaks into small bubbles and stops flowing in large blobs. Switch it off when you go to bed or put it on a timer plug.
If you want the glow without the warm up, a moon lamp or a galaxy projector are the usual alternatives. A moon lamp is a printed sphere with an LED inside, often rechargeable, with warm and cool settings. A projector throws stars or clouds onto the ceiling, usually with a timer, which suits a bedroom at night. Both stay cool and switch on instantly, though neither has the slow movement of lava lamps.
Wipe the glass with a dry cloth when the lamp is cold and never open the bottle. If the wax stays in one tall column, the room is too warm or the lamp has run too long; let it cool and try again. If it stays at the bottom, the room may be too cold or the bulb may be the wrong wattage.
Usually between 45 minutes and two hours once the lamp has been used a few times. The first runs can take longer, and a cold room slows it down.
It is best not to. Most makers recommend no more than eight to ten hours at a time, then a full cool down, to avoid overheating the wax.
Coloured wax and a clear liquid sealed in a glass bottle, heated by a bulb in the base. The exact recipes are kept by each maker and the bottle should never be opened.
Yes. They remain a favourite for bedrooms, desks and gaming setups because the slow movement and soft light work well in a dim room.
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