Jellyfish Lamp A 2.5 Litre Tank

$34.99

A 2.5 litre jellyfish lamp: four jellyfish drifting on a brushless pump, two flow speeds plus still, seven colours, and a USB-C cable that runs off a power bank.

Seven Colours, Or A Slow Fade Two Speeds, Plus Still Getting Them To Swim A Brushless Pump, And Very Little Noise

Quantity

1

Size·White

Free U.S. shipping · 30-day returns

Two and a half litres is the number that matters here. Most a desk-sized jellyfish lamp holds is under a litre, and in that little water four jellyfish would be tripping over each other. This jellyfish lamp gives them a full 2.5 litre column, roughly eleven inches tall and five across, so all four can be at different depths at once and the one nearest you is not always in front of the others.

Underneath this jellyfish lamp is a brushless pump rather than the usual brushed one. The difference is noise: brushed motors develop a whine as they wear, and this one does not have brushes to wear. The seller publishes it under 25 dB, and what you hear at arm's length is moving water rather than a mechanism — which is the whole point of a jellyfish lamp on a bedside table.

Flow has two speeds and a stop. Slow gives a long lazy drift, normal moves them properly, and still switches the pump off so the water settles and the four of them simply hang there. That last one is the setting for a desk you are actually trying to work at — the movement is the point of a jellyfish lamp right up until you need to concentrate.

The light is seven colours, or an RGB breathing gradient that fades between them. Three buttons on the front of the base handle all of it, plus the 8-hour timer that shuts the jellyfish lamp down on its own. There is no remote in the box, which is worth knowing before it arrives.

Power is a 1.2 metre USB-C cable, and that length is chosen rather than accidental: it reaches a laptop or a power bank, so the tank can sit on a shelf with no socket behind it. The lid rotates and locks down onto a silicone seal, so a full jellyfish lamp stays a full one if the shelf gets knocked.

One thing nobody mentions until you own a jellyfish lamp: a brand-new jellyfish traps air under its bell and floats at the top instead of circulating. A stainless rod comes in the box, and a stir with it releases the bubble. It is a two-minute job on day one and then never again.

Seven Colours, Or A Slow Fade
Two Speeds, Plus Still
Getting Them To Swim
A Brushless Pump, And Very Little Noise

One size, two shell colours. What matters is shelf height and cable reach.

Capacity – 2.5 litres; about 11" tall × 5" across
Colours – white or black; identical hardware in each
Power – 1.2 m USB-C cable included; runs off a power bank or a laptop
Controls – three buttons on the front of the base; no remote
Lid – rotating lock lid onto a silicone seal
Before first use – fill with water, add the four jellyfish upside down, a few drops of washing-up liquid, and stir with the rod until they sink

Stand it on a flat, steady surface. To clean it, tip the water out, lift the jellyfish free, rinse and refill.

Type: water-filled jellyfish lamp, 2.5 litre cylinder tank
Size: about 11 in tall × 5 in across; 2.5 L capacity
Tank: clear cylinder, filled with water by you; rotating lock lid with a silicone seal
Contents: four synthetic jellyfish, removable
Movement: brushless motor; two flow speeds plus still; published under 25 dB
Light: 7 colours, or an RGB breathing gradient
Timer: 8-hour auto shut-off
Controls: three buttons on the base; no remote
Power: 1.2 m USB-C cable included; runs off a power bank
Also included: stainless stirring rod
Colours: white or black
Care: empty, rinse and refill; wipe the base with a dry cloth

Free shipping on every U.S. order. No minimum.
Delivered in 5–9 business days after a 1–2 day handling time.
30-day returns – if the fit isn't right, send them back.

Two and a half litres. Four of them, drifting.

SEVEN COLOURS

Seven Colours, Or A Slow Fade

Seven colours held on whichever one you press, or an RGB breathing gradient that fades between them on its own. The whole 2.5 litre column carries the colour, not just the base.

Seven Colours, Or A Slow Fade
Seven colours held on whichever one you press, or an RGB breathing gradient that fades between them on its own. The whole 2.5 litre column carries the colour, not just the base.

TWO SPEEDS AND A STOP

Two Speeds, Plus Still

Slow is a long lazy drift; normal moves them properly. Still stops the pump so the water settles and the four jellyfish hang where they are — the setting for a working desk.

Two Speeds, Plus Still
Slow is a long lazy drift; normal moves them properly. Still stops the pump so the water settles and the four jellyfish hang where they are — the setting for a working desk.

DAY ONE

Getting Them To Swim

New jellyfish trap air under the bell and float. Fill the tank, drop them in upside down, add a few drops of washing-up liquid and stir with the rod in the box until they sink. Then never again.

Getting Them To Swim
New jellyfish trap air under the bell and float. Fill the tank, drop them in upside down, add a few drops of washing-up liquid and stir with the rod in the box until they sink. Then never again.

THE PUMP

A Brushless Pump, And Very Little Noise

No brushes means no whine as it wears, and the seller publishes it under 25 dB. There is an 8-hour auto shut-off as well, so it turns itself off overnight.

A Brushless Pump, And Very Little Noise
No brushes means no whine as it wears, and the seller publishes it under 25 dB. There is an 8-hour auto shut-off as well, so it turns itself off overnight.

WHAT COMES WITH ITFree U.S. shipping30-DAY RETURNSSecure checkout

Brushless pump, deep tank. And a button for still.

01

Seven Colours, Or A Slow Fade

Seven colours held on whichever one you press, or an RGB breathing gradient that fades between them on its own.

02

Two Speeds, Plus Still

Slow is a long lazy drift; normal moves them properly.

03

Getting Them To Swim

New jellyfish trap air under the bell and float.

04

A Brushless Pump, And Very Little Noise

No brushes means no whine as it wears, and the seller publishes it under 25 dB.

How we compare.

Where a 2.5 litre tank with a brushless pump differs from a small tank and a lamp.

Ours

A small desk jellyfish lamp

A plain LED mood light

2.5 litres of water, four jellyfish

Brushless pump, published under 25 dB

Two flow speeds plus a still setting

Seven colours or a breathing gradient

Runs off a power bank over USB-C

Rotating lock lid with a silicone seal

Frequently asked
questions.

The questions people actually ask before buying one.

2.5 litres. The cylinder is about eleven inches tall and five across, which is what gives four jellyfish enough depth to sit at different heights instead of stacking up.

Four, in the box. They lift straight out when you want to empty or rinse the tank, and they go back in the same way.

A new one traps air under its bell. Fill the tank, put each jellyfish in upside down to shake the air out, add a few drops of washing-up liquid to break the surface tension, and stir with the stainless rod in the box until they drop. It is a first-day job only.

Two moving speeds, slow and normal, plus a still setting that stops the pump altogether. The listing quotes three in one place and two in another; two speeds plus still is what the product's own panel shows.

No. Three buttons across the front of the base do power, colour and flow. Nothing to lose, but nothing to change from across the room either.

A 1.2 metre USB-C cable is included. It will run off a wall plug, a laptop or a power bank, which is what lets it stand somewhere with no socket behind it.

Yes, after 8 hours. Leave it on when you go to bed and it will have shut down by morning.

Free U.S. shipping and a 30-day return window. Fill it, live with it for a week, and send it back if it is not what you pictured.