Do LED Neon Signs Get Hot? And 9 Other Things People Ask Before Buying

Neon signs are one of those things people want for a year before they buy one, mostly because of a handful of questions nobody answers properly. Is it hot. Is it dangerous. Is it going to cost a fortune to leave on. Will it wreck the wall.

Here are the ten that come up most, answered straight, including the two where the answer is not what you were hoping for.

The short answer

LED neon signs do not get hot. They contain no glass and no gas, run on 5V USB, cost roughly 60p a month to leave on eight hours a night, and hang on hooks rather than screws. They are safe to leave on overnight and safe in a child's room. The two catches: they do not come with a mains plug adapter, and they are decoration rather than room lighting.

1. Do LED neon signs get hot?

No. This is the question that gets asked most and the answer is genuinely reassuring.

Real glass neon works by running a current through gas inside a sealed tube, and the tube gets warm. An LED neon sign does not do that. It is a line of small LEDs inside a flexible silicone tube, mounted on a clear acrylic backing, and LEDs convert most of their energy into light rather than heat.

In practice a sign may feel very slightly warm after several hours on full brightness, in the way a phone charger does. It will not burn anyone, it will not mark a wall, and it will not be a fire risk behind a curtain or above a bed.

2. Is it real neon?

No, and that is the reason it is affordable and the reason it survives being posted to you.

Real neon is glass tubing bent by hand over a flame and filled with gas. It is beautiful, expensive, fragile and hot. What you are buying instead is LED flex neon: a soft silicone tube holding a run of LEDs, mounted on a clear acrylic panel cut to the shape of the design. From a metre away, on a wall, the two look extremely similar, because the acrylic mostly disappears and the shape reads as a solid glowing object.

What you lose is the slight flicker and the hum of the real thing. What you gain is a sign that does not shatter, does not get hot, weighs almost nothing and costs a fraction as much.

3. Are they safe to leave on all night?

Yes. No heat, no gas, no glass and no flicker, and most of ours are CE certified, which is the standard that covers exactly this kind of question.

The practical point is brightness rather than safety. A sign at full brightness will light a bedroom more than you want at three in the morning. Nearly every sign in our range dims, and dimmed low they sit somewhere around night light territory, which is how most people actually run them. If you want it off without crawling behind the furniture, look for one with a switch built into the unit, like the acrylic rocket sign.

4. What does it actually cost to run?

Very little, and here is the working rather than a vague reassurance.

These run on 5V USB. The most a standard phone charger will give one is about 10W, and most signs draw well under that. Take the worst case of 10W, leave it on for eight hours every night, and you use roughly 2.4 kWh in a month. At the October 2026 energy price cap of about 26p per kWh, that is around 60p a month.

For scale, that is about sixteen cups of tea. Running it all day every day would still come in under two pounds a month.

5. Does it come with a plug?

This is the first of the two honest catches. No, there is no mains adapter in the box.

What you get is a USB lead. You plug that into a phone charger, a laptop, a TV's USB port or a power bank, exactly like a phone. Almost everyone has a spare USB plug in a drawer, but it is worth checking before it arrives rather than after.

There is an upside to this that people underrate. A USB sign will run off a power bank, which means it works at a party, in a bit of the room with no socket, or on a shelf on the other side of the room from the nearest plug. A mains sign never does that.

A few signs are rated 110 to 240V, which simply means the electronics are happy on UK mains once you plug the USB lead into any adapter. That is stated on the individual product page.

6. How do I hang one without wrecking the wall?

Hooks, almost always. Most of ours come with adhesive hooks or a hanging chain and pre drilled holes, so you get a choice between a pin hole and nothing at all.

Three approaches, in order of how much your landlord would care:

• Stand it on something. A lot of signs sit perfectly well on a shelf, a desk or a windowsill leaning against the wall. Zero contact, zero risk, and it looks deliberate.
• Adhesive hooks. Two small hooks take the weight of a sign easily, because there is almost no weight to take. Same caveats as any adhesive on matt emulsion, which our guide for renters goes through properly.
• A nail or a screw. If the sign has pre drilled holes and a chain, one small nail is all it needs. Smaller hole than a picture hook.

Then run the USB lead down behind the furniture. A loose white cable down a dark wall is the thing that makes a good sign look cheap, and it takes two minutes to avoid.

7. Can I put one outside or in a bathroom?

Outside, often yes. Bathroom, no, and it is worth being clear about why.

Several of our signs are CE certified for indoor, outdoor and commercial use, which covers a covered porch, a garden bar or a summerhouse. One, the cherry neon sign, carries an IP65 rating, which is the proper measure of water resistance and means rain is genuinely fine.

A bathroom is a different problem. Steam gets everywhere and sits on everything, and unless a fitting carries an IP rating that covers moisture, it has no business in one. None of these are sold as bathroom fittings. If a seller tells you an unrated sign is bathroom safe, they are guessing on your behalf.

8. Will it be too bright for a bedroom?

Only if you buy one that does not dim, and most of ours do.

The useful way to think about it: a sign at full brightness is a feature you switch off to sleep, and a sign dimmed low is lighting you can leave on. The dimmable ones give you both, which is why they suit a bedroom and the fixed brightness ones suit a bar.

Size matters as much as brightness. For a bedroom wall, something in the 30 to 40cm range sits comfortably above a bed or a desk. Bigger than that starts to own the room, which is great above a sofa or behind a bar and a lot in a box room.

9. How long does one last?

Years of normal use. LEDs fade slowly rather than blowing, so the failure mode is a sign that is gradually a bit dimmer rather than one that stops one evening.

To put a number on it, the Bongo Cat sign is tested to 5,000 hours with under 8% light decay. At four hours a night that is over three years before you would notice anything at all.

10. Can I get one with my own name on it?

Not from us, and this is the second honest catch. Everything here is a ready made design rather than a custom order, which is what keeps the prices where they are and the delivery times reasonable.

If a name or a word is specifically what you want, a custom shop is the right place for it and it will cost you several times as much. If what you actually want is something that feels personal, a design that matches the person usually lands better than their name in cursive. Cat Neon Signs exists because that turned out to be true more often than not.

The short version

They do not get hot, they are not real neon, they are safe overnight and in a child's room, and they cost around 60p a month to run. They hang on hooks or stand on a shelf. They do not come with a mains plug, and we do not do custom designs.

Everything else is a question of which one you want on the wall. Start with LED Neon Signs, or Cat Neon Signs if the answer to that was always going to be a cat. If you are still deciding between a sign, a strip and fairy lights, we compared all three in this guide.