Modern lighting design of interiors and building facades has undergone revolutionary changes with the advent of flexible neon. This material, often called LED neon, is fundamentally different from classic gas-discharge tubes filled with inert gases, although visually it creates a similar effect of uniform glow. Understanding exactly how this system works is critical to properly selecting equipment, calculating grid loads, and ensuring the longevity of the design.
Unlike traditional glass, the light source here is semiconductor crystals enclosed in a durable polymer shell. Silicone matrix performs the function not only of protection from moisture and mechanical damage, but also of a powerful light diffuser. It is thanks to this layer that the individual points of the diodes merge into a single, continuous luminous line, devoid of dark spots and flickering, which is often found in cheap analogues.
The operating principle is based on the conversion of electrical energy into light radiation inside a solid body, which makes the system much safer and more energy efficient than its gas counterparts. The absence of high voltage inside the luminous tube itself (in low-voltage versions) and fragile glass elements allows the use of flexible neon in places where traditional solutions would be unacceptable. Next, we will analyze in detail the internal architecture of the product.
Internal architecture and light guide design
Structurally flexible neon is a multi-layer “pie”, where each layer performs a strictly defined function. In the center of the composition there is a flexible printed circuit board (FPC), on which LEDs and current limiting resistors. The board is made of elastic materials, which allows the cord to be bent at a certain angle without breaking the electrical contacts.
A layer of transparent or translucent silicone is applied around the board using extrusion or casting. This material has a high degree of light transmission, but at the same time effectively scatters the directional light of the diodes. The thickness of this layer varies depending on the required brightness and luminescence density. For color versions, colored silicone or colored diodes are often used to mix the light into a single gamut.
The outer layer is a dense silicone shell, often with a ribbed or smooth texture. It protects internal components from ultraviolet radiation, temperature changes and mechanical stress. Some models may have an additional layer between the board and the outer case phosphor or a diffusing gel that finally evens out the light flux.
SMD technology vs COB
what is the difference?: Classic flexible neon uses SMD diodes, which are visible as individual dots when turned off or the quality of the diffuser is low. More modern models use COB (Chip on Board) technology, where the crystals are applied directly to the board in a dense layer. This allows you to achieve a perfectly uniform line of light even without a powerful diffuser, making the glow softer and more professional.
It is important to note that the tightness of the structure is achieved due to the solidity of the silicone case. Such tape is cut only in specially marked places where contact pads are located. Violation of the integrity of the shell in other places will lead to moisture ingress and failure of the device.
Physics of glow and color reproduction
The basis of brightness and color in flexible neon are LEDs. The principle of their operation is based on the recombination of electrons and holes in a semiconductor crystal, which is accompanied by the emission of photons. Depending on the chemical composition of the semiconductor, the emitted light can have different wavelengths. To produce white light, blue diodes coated with a layer of yellow phosphor are most often used.
The key parameter here is color rendering index (CRI), which shows how natural objects look under this light. High-quality flexible neon for interior lighting should have a CRI above 80, and for storefronts or studios - above 90. Cheap models often suffer from a low CRI, which can cause colors in the room to appear faded or distorted.
- 🔴 Monochrome glow: achieved by using diodes of a specific color (red, green, blue) or a painted housing.
- 🌈 RGB modulation: one diode housing contains three crystals (Red, Green, Blue), the mixing of which gives millions of shades.
- ⚪ Warmth of light: measured in Kelvin, where 2700K is warm yellow light and 6000K is cool bluish.
Color management in RGB models is carried out by changing the brightness of each of the three channels separately. This requires the use of special controllers that produce signals at a high frequency that is invisible to the human eye. Thanks to this, we see a smooth flow of colors rather than blinking.
When choosing neon for a photo studio or clothing store, be sure to check the color rendering index (CRI). Even a powerful light with a low CRI will ruin the appearance of the product or makeup in photos.
Power systems and brightness control
Flexible neon, in the vast majority of cases, operates on low voltage direct current. Standard denominations are 12 V and 24 V. Using a higher voltage (24V) is preferable for long runs as it reduces the current load on the conductors and minimizes the voltage drop towards the end of the line, ensuring uniform brightness along the entire length.
To connect to a home network 220 V Power supplies (drivers) are needed that convert alternating current into direct current. The power of the unit should be selected with a margin of 20-30% of the total power of the connected neon. This will prevent the transformer from overheating and extend its service life. An attempt to run the system “back to back” in terms of power will lead to pulsations of light and rapid failure of the equipment.
| Parameter | 12 Volt | 24 Volt | 220 Volt (High Voltage) |
|---|---|---|---|
| Security | High | High | Requires caution |
| Max. line length | Up to 5 meters | Up to 10 meters | Up to 50-100 meters |
| Cutting pitch | 2.5 - 5 cm | 5 - 10 cm | 50 - 100 cm |
| Application | Interior, car | Facades, interior | Architectural lighting |
Brightness control (dimming) is carried out using pulse width modulation (PWM). The controller quickly turns the power on and off, varying the timing of the “on” and “off” times. To the human eye this appears as a change in brightness. It is important to use compatible dimmers to avoid visible flicker at low brightness levels.
Heat dissipation and heat dissipation
Despite the high efficiency of LEDs, some of the energy still turns into heat. Unlike open LED strips, flexible neon is enclosed in a silicone casing, which has thermal insulating properties. This creates a risk of overheating of the crystals, especially in high-power models, which leads to degradation of the phosphor and loss of brightness.
Degradation is an irreversible process of decreasing luminous flux over time. When overheated, it happens many times faster. That is why for powerful lines (more than 14 W/m) the use of aluminum profiles is recommended. Aluminum acts as a heatsink, dissipating heat from the board to the outside, while the profile itself can be hidden or, conversely, serve as a design element.
⚠️ Attention: Never leave powerful flexible neon wound on a reel on for more than 15-20 minutes. The absence of a heat sink when rolled up will lead to instant overheating and melting of the silicone or fire.
In low-voltage models with moderate power, heat dissipation occurs naturally through the silicone surface. However, when installing in niches or closed boxes, it is necessary to provide ventilation gaps. Heat accumulation in a confined space without air circulation is detrimental to electronics.
An aluminum profile for flexible neon is not only a decoration, but also a vital element of the cooling system, increasing the service life of the diodes by 2-3 times.
Installation features and sealing
Installation of flexible neon requires compliance with a number of technical rules. Since the material bends only in one plane (perpendicular to the plane of the board), attempts to bend it sideways will lead to breakage of the conductive paths. The bending radius is usually from 2 to 5 cm, depending on the specific model and thickness.
Fastening is carried out using special plastic clips that are screwed to the surface, or by gluing into an aluminum profile with double-sided tape. When using clips, it is important not to pinch the body so as not to deform it and break the seal. The clip mounting step is 30-50 cm for horizontal surfaces and 20-30 cm for vertical surfaces.
- 🔪 Cutting: done strictly along marked lines with scissors or a sharp knife.
- 🔌 Connection: connectors must fit tightly to the contacts, gaps are unacceptable.
- 💧 Sealing: cutting and joining areas must be sealed with silicone plugs and glue.
Particular attention should be paid to sealing cut points and joints, especially for outdoor installation. For this purpose, special silicone caps and sealant are used. Even for indoor versions (internal use), protecting contacts from oxidation will extend the life of the system.
☑️ Check before launch
Operation and typical malfunctions
During operation, flexible neon can encounter a number of problems. The most common of them is partial extinction of the segment. This usually indicates a broken conductive path due to excessive bending or mechanical damage. In series circuits (often found in high-voltage neon), failure of one element can extinguish the entire segment.
Another common problem is discoloration or yellowing of the casing. This is a sign of silicone aging under the influence of ultraviolet radiation or overheating. High-quality materials have added UV stabilizers, but even they do not last forever. For outdoor use, choose models marked IP67 or IP68 and guaranteed against fading.
Flickering lights often indicate a faulty power supply or controller. If the unit cannot cope with the load or one of its capacitors fails, ripples appear at the output. In RGB systems, flickering can be caused by overheating of the controller or poor contact in the control circuit.
⚠️ Attention: If you notice that the silicone case has become sticky or has changed color to brown, please turn off the power immediately. This is a sign of thermal degradation of the material, which creates a risk of short circuiting.
Regular cleaning of dust and dirt will help maintain brightness and heat output. Wipe the surface with a soft, damp cloth, avoiding the use of aggressive solvents that can damage the silicone structure.
FAQ: Frequently asked questions
Can flexible neon be cut anywhere?
No, you can only cut in specially marked places (usually every 2.5, 5 or 10 cm) where the contact pads are visible. A cut elsewhere will damage the diodes' power supply circuit and the segment will stop working.
Does flexible neon get hot during operation?
Yes, there is heating, especially in powerful models. Low-voltage neon heats up moderately, while high-voltage neon (220V) can heat up noticeably. For powerful lines, it is recommended to install them in an aluminum profile to dissipate heat.
What is the difference between regular LED neon and COB?
The conventional one uses individual diodes, which can be visible as dots. In COB (Chip on Board) technology, the crystals are applied continuously, which gives a perfectly uniform line of light without “pointing” even without a thick diffuser.
How long does flexible neon last?
The average service life of high-quality LED neon is from 30,000 to 50,000 hours of operation. After this period, the brightness may decrease by 30%, but the glow usually remains.
Is it possible to connect pieces of neon of different lengths?
Yes, but the total length of the series-connected sections should not exceed the maximum permissible for this type (usually 5-10 meters for 12/24V). Exceeding the length will result in a voltage drop and a dim light at the end of the circuit.