LED neon or traditional glass neon tube? Consumption, lifespan, repairability
An illuminated shop-window sign can today be built from two technologies that look almost identical: hand-bent glass neon tube, or LED neon flex profile. From the outside the difference is barely visible; in the installation drawing, the service log and, to a lesser extent, the electricity bill, it is anything but.
What is the difference between LED neon and a traditional neon tube?
Traditional neon is a hermetically sealed, hand-bent glass tube in which rarefied noble gas glows when several thousand volts across the electrodes at each end create a discharge. LED neon - properly called neon flex - is by contrast a row of LEDs cast into a silicone or PVC jacket, whose milky, light-diffusing face smears the point light of the individual LEDs into a continuous line. From the outside the two look very similar; inside, everything differs: one is a gas-discharge light source at high voltage, the other a semiconductor at extra-low voltage. Every other difference follows from that single one - consumption, failure mode, repairability, the safety requirements of installation, and the cost drivers too. Anyone looking for a neon sign today will generally be quoted LED neon flex: glass-tube bending has become a craft trade, and the pumping and gas-filling workshop that goes with it is available in far fewer places than a LED installer.
Consumption: how much does a metre of neon use? A worked example with a six-metre sign
The typical power draw of LED neon flex is 8-14 watts per linear metre, depending on the profile type, the LED density and the brightness; high-brightness and RGB profiles draw more than that. Trade sources generally give traditional glass neon tube 15-20 watts per linear metre, depending on tube diameter and the current flowing through it - the secondary current of neon transformers is typically 20-60 milliamps. A concrete example: a sign drawn with six linear metres of tubing takes around 60 W in LED neon at 10 W/m, and 90-120 W in glass neon at 15-20 W/m. Running 12 hours a day - that is 4,380 hours a year - the LED version consumes roughly 263 kWh and the glass neon around 394-526 kWh over a year. With typical figures that is about a 40 per cent difference: noticeable, but not an order of magnitude, and on a single sign it rarely tips the decision. Where LED neon genuinely does more: it can be dimmed, so consumption can be reduced further by turning it down overnight. Both technologies, though, can have their operating hours shortened with a timer or a dusk switch, and that is not a LED advantage.
Lifespan: what does 30,000 mean, and what does 100,000?
Datasheets for LED neon flex quote anything between 30,000 and 100,000 hours, because they are not measuring the same thing. The realistic design figure is 30,000-50,000 operating hours to L70, that is, for as long as brightness stays above 70 per cent of the initial value; at 12 hours a day that is roughly 7-11 years. Importantly, the L70 figure is temperature dependent: the same profile might give 50,000 hours in a 25 degree Celsius laboratory environment, but falls to around 30,000-40,000 hours at higher jacket temperatures, because heat escapes a sealed silicone jacket less readily than a finned LED module. That is why it cannot be compared directly with the figure familiar from LED walls either: our own LED module datasheets consistently give 100,000 operating hours, but the industry measures that to L50, to half the original brightness, not to L70 - at 12 hours a day, more than two decades of operation. If a quotation contains a lifespan figure, always ask whether it is L70 or L50, and at what operating temperature. Trade sources generally give traditional neon tube 8-15 years - so on lifespan the two technologies are not as far apart as the marketing material suggests. The real difference is in the failure mode: with LED neon, brightness declines gradually and predictably, whereas with a neon tube, electrode wear, gas contamination, a crack or a transformer fault causes sudden, total failure.
LED neon and glass neon compared
The table below sets twelve measurable or clearly decidable properties of the two technologies against each other. If a single row had to be singled out, it would be operating voltage: the 12 or 24 volts of LED neon is, in electrical safety terms, an order of magnitude simpler than the several thousand volts of a neon tube, and it determines where and under what conditions the sign can be installed. The second most important row is repairability: that is what decides whether a fault stops the illuminated sign for days or for weeks - and for a shop that stays open, that often costs more than the part itself. The consumption row is secondary by comparison.
Safety: 24 volts against 15,000 volts
A traditional neon sign needs a neon transformer whose secondary side typically delivers between 3,000 and 15,000 volts - datasheets list types from 1,000 up to 15,000 volts - and the tubes must be wired with dedicated high-voltage cable rated for that voltage. This has concrete consequences: the wiring needs a qualified installer, clearance has to be kept around the tubes and cable, and the system has to be isolatable for servicing. LED neon, by contrast, runs on 12 or 24 volts of extra-low voltage, so the profile itself is safe to touch - mains voltage is present only on the primary side of the power supply, which sits in a sealed box, usually well away from the sign. That is why LED neon can be used on a window shelf, behind a counter, in a living space or as event decoration, where glass neon is simply out of the question. The same difference shows up in fragility: neon flex cast in silicone can be bent and does not break in transit, whereas a neon tube shatters if a ladder knocks into it.
Colours: why is only red true neon?
Few people know that pure neon gas gives a single colour: the characteristic red-orange. Every other colour comes from argon gas, an argon-mercury mixture and a phosphor coating applied to the inside wall of the tube - blue is typically argon, white and green an argon-mercury combination, and further shades are made with phosphor coatings. Most of what everyday speech calls a neon sign therefore does not actually glow with neon gas at all. This has two practical consequences. One is that the colour choice becomes final at the moment of manufacture: a blue neon tube will never be warm white. The other is that once mercury-containing tubes are worn out or broken they count as hazardous waste, so their removal and disposal have to be arranged separately. LED neon, by contrast, can be varied freely: in single-colour form almost any shade can be ordered, and with an RGB profile the same sign changes colour, dims, animates or switches on a timer. If the sign is also part of the mood lighting in a cafe or a salon, that flexibility alone can settle the question.
Limits of form: what lettering can each technology carry?
This is the one point where glass neon has a genuine technical advantage. Neon tube is typically 8-15 millimetres in diameter, and a bending craftsman can form practically any curve, sharp break or tiny loop in it, so fine calligraphic lettering can be reproduced faithfully. The cross-section of LED neon flex is typically between 6x12 and 20x20 millimetres, its minimum bending radius according to manufacturers' profile datasheets is usually 2-5 centimetres depending on the profile, and the profile may only be cut at the cut points the manufacturer has marked - often every 5 centimetres on 24 volt versions, and every 2.5-10 centimetres on others. Exceeding the bending radius is not merely an aesthetic question: the LEDs inside the jacket can fracture, leaving a permanent dark patch. A logo with very fine linework and small details therefore either cannot be made in neon flex at all, or only in simplified form. The correct procedure is to have the artwork redrawn to the limits of the chosen technology before the decision is made, and to ask for a full-size 1:1 proof.
Price: what drives the cost of a neon sign? The five factors that move a quotation
The price of an illuminated sign starts not from the width of the sign but from the linear metres needed to draw the letters - a long, thin word can be cheaper than a short logo with double lines. The five main cost factors are: (1) the quantity of linear metres and the number of bends, because every curve is separate labour; (2) the construction of the backing - a contour-cut, laser-cut acrylic or sheet-metal back is considerably more work than a rectangular board; (3) the outdoor build, that is, the ingress protection, the weatherproof power supply and the method of fixing; (4) the control, that is, whether a switch is enough or dimming, colour change and timing are also needed; (5) the circumstances of installation - facade height, whether a lift is needed, the location of the power feed. Glass neon adds the number of transformers and the high-voltage wiring; LED neon adds the sizing of the power supply. That is why two signs of apparently identical size often attract markedly different quotations - and why thinking purely in square metres or unit prices is misleading.
Repairability: where the long-term cost is decided
On a LED neon sign, the typical fault is a failed power supply or a section going dark. Both are modular problems: the power supply can be swapped, the faulty section can be cut out at the cut points and replaced, the work can generally be done within days, and the sign does not stand dark for weeks. With a cracked neon tube, by contrast, the gas escapes immediately, the tube goes out, and the repair is not an on-site job: that tube has to be taken down, carried to a glassblower's workshop, re-bent or replaced there, pumped down and refilled. That turnaround is therefore measured in weeks, not days. This difference is the most important business consideration for a shop that stays open: a sign standing dark is not just advertising lost, it is an actively bad message to the passer-by. So it is worth asking at the quotation stage where the nearest service point is, whether spare parts are held in regional stock, and what call-out time is committed to.
Outdoor use: ingress protection, weather, brightness
For LED neon intended for outdoor use, the expectation is at least an IP65 profile and a sealed, outdoor-rated power supply - or, better still, the power supply stays in a protected indoor location and only the 12 or 24 volt cable goes outside. The sealing of the end caps is a critical point: outdoor neon flex faults typically start where the cut end of the profile has not been properly closed. Glass neon outdoors needs a sealed, watertight housing and an outdoor transformer, because moisture at the high-voltage point can cause tracking currents. In terms of brightness, both technologies are made for an evening and dusk effect, not as a display readable in blazing sunlight: if the surface has to be legible in midday light, the right answer is not neon but a high-brightness LED sign or LED wall. There the professional minimum is 4,500-5,000 nits with automatic brightness control; our own outdoor LED modules deliver 5,000-8,000 nits. Local rules may also cap the brightness of advertising displays, particularly after dark, so brightness regulation is a requirement rather than an option - check what applies at your location. Weather extremes cause no problem for either technology in themselves, but because of thermal expansion, the durability of neon flex fixed to a rigid backing depends on how the fixing is executed.
When should you still choose real glass neon?
There are three situations in which glass neon is a defensible decision. The first is an authentic retro interior: for a barber shop, a cocktail bar or a record shop, the materiality of real neon tube, the characteristic light of the gas discharge and the physical presence of the glass give an authenticity that neon flex can only approach. The second is very fine, calligraphic lettering that the bending radius and cross-section of neon flex will not allow. The third is the restoration of an existing old sign in a protected or listed setting, where the aim is not to introduce new technology but to preserve the original. In every other case - shopfront, window, reception, event, facade logo - LED neon is the rational choice, primarily because it is safer, faster to repair and controllable, and secondarily because it uses less power.
LED neon or a programmable LED sign?
LED neon has one fundamental limitation: the content of the sign becomes final at the moment of manufacture. If a company name, a logo or a permanent slogan is what lights up, that is no problem - these do not change for years. If, however, the sign is meant to carry changing information such as a daily offer, opening hours, a current price or a seasonal promotion, then neon is the wrong tool for the job, and a programmable LED sign or a LED scrolling sign is needed instead, whose content can be rewritten in software at any time. In practice many shops combine the two: a permanent LED neon company name or logo on the shopfront, with a smaller LED sign alongside it for the changing message. That arrangement works well because the decorative element that sets the mood and the updatable surface that carries the information are two separate jobs, and each is more easily solved on its own than with a single compromise.
Consents: what to sort out before installation
Putting an illuminated sign on a facade or over public space is not purely a technical question: what is permitted in terms of townscape and use of public space is set by the local authority, and the rules vary from one municipality to the next. This is entirely independent of the technology - LED neon and glass neon run into exactly the same rules. Two things are worth clarifying before you order manufacture: whether the planned size and position require a notification or a consent in your locality, and, in a rented property, whether the owner - or in a block of flats, the building management - agrees to fixing to the facade. Since the size and shape of a bespoke sign cannot be changed once it has been made, a refused application causes a serious loss. Always check the current local requirements with the relevant authority; we have written up the process in detail in our article on consents for outdoor signage.
How to ask for comparable quotations
Quotations for illuminated signs are hard to compare because they do not price the same content. Four things are worth seeing on separate lines in every quotation: the sign itself (linear metres and technology), the backing or support structure, the power supply and the control, and the installation. If these appear as a single sum, the quotation cannot be compared with another. Beyond that, ask for the manufacturer of the profile or tube, the power per metre, the ingress protection rating, and whether the stated lifespan refers to L70 or L50 - from these you can work back to whether the power supply has been sized with adequate headroom and how realistic the promised lifespan is. Our site survey is free of charge, and that is when the few practical details emerge - the location of the power feed, the load-bearing capacity of the facade, the typical viewing distance and the light conditions through the day - that actually determine the final technology decision.
Expert tip
Before you have anything made, print the sign at 1:1 scale - taped together from several A4 sheets if need be - stick it up in its final position, and look at it from the point where the passer-by or the driver will actually see it. The most frequent and most expensive mistake is not choosing the wrong technology but undersizing the sign: it looks big on paper and disappears on the facade. At the same time, measure the linear metres needed to draw the letters: multiply that by the watts per metre and you get the power required, which lets you check whether the power supply in the quotation has been sized with at least 20-30 per cent headroom. Without that headroom, a power supply run at its nominal limit gets hot, and the higher operating temperature shortens exactly the lifespan you chose LED neon for.
Common mistakes
1. Ordering a logo full of small details and fine linework in neon flex, when the 2-5 centimetre minimum bending radius given in manufacturers' profile datasheets and the factory cut points do not allow it; the detail is lost or distorted. 2. Sizing the power supply with no headroom: the profile runs constantly at the limit of its nominal output, the supply gets hot, and the higher temperature shortens the life of the LEDs. At least 20-30 per cent headroom should be left. 3. Fitting indoor, IP20 neon flex outdoors, or failing to seal the cut end of the profile - outdoor failures typically start there. 4. Treating lifespan figures as comparable, when one datasheet gives L70 and the other L50, and the measurement temperature differs too; this needs clarifying at the quotation stage. 5. Asking only for the price per linear metre, without the backing, the power supply, the control and the installation, then trying to choose between two quotations that cannot be compared. 6. Trying to solve changing content - a daily offer, a price, opening hours - with a neon sign, when neon content becomes final at manufacture; a programmable LED sign or a LED scrolling sign is the tool for that. 7. Ordering glass neon without asking where the workshop is that can re-bend and refill a broken tube - so the weeks-long repair turnaround comes as a surprise. 8. Intending neon to serve as a display readable in blazing sunlight, when both technologies are made for evening and dusk; daytime legibility needs a high-brightness LED sign or LED wall.
| Aspect | LED neon (neon flex) | Traditional glass neon tube |
|---|---|---|
| Operating voltage | 12 V or 24 V extra-low voltage; the profile is safe to touch | typically 3,000-15,000 V with a neon transformer and high-voltage cable |
| Consumption | approx. 8-14 W per linear metre, depending on profile and brightness | approx. 15-20 W per linear metre, depending on tube and current |
| Annual consumption, 6 m sign, 12 hours a day | approx. 263 kWh (calculated at 10 W/m) | approx. 394-526 kWh |
| Lifespan | 30,000-50,000 operating hours to L70; less at higher jacket temperatures | trade sources typically give 8-15 years |
| Typical failure mode | gradual, predictable loss of brightness; section or power supply fault | electrode wear, gas contamination, cracking, transformer fault - sudden total failure |
| Colours | almost any shade; switchable on the fly in RGB versions | gas dependent: pure neon = red-orange, other colours from argon, argon-mercury and phosphor |
| Dimming, animation | dimmable, schedulable, animatable, with app or DMX control | typically on/off only; dimming is awkward |
| Fragility | silicone or PVC jacket, bendable, does not break in transit | glass tube, sensitive to impact and mechanical load |
| Repair | replace the faulty section or power supply, typically within days | glassblower's workshop: removal, re-bending, pumping, gas filling - weeks of turnaround |
| Outdoor version | IP65-IP67 profile plus a sealed, outdoor (or indoor-kept) power supply, with sealed end caps | watertight sealed housing plus an outdoor transformer |
| Finest lettering | 6x12 to 20x20 mm cross-section, 2-5 cm minimum bending radius (manufacturer's profile datasheet), factory cut points | 8-15 mm tube diameter, hand-bent to almost any curve or tiny loop |
| Waste handling | electrical and electronic waste | hazardous waste for mercury-containing tubes |
A few questions and you get the recommended pixel pitch, the size and an indicative price.
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