Through hole LED
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Description:
4mm LED Diode, 12mm Long Lens Head LED – High-Focus Indicator Lighting Solution
The 4mm LED diode with a 12mm long lens head is a precision-engineered light component designed for applications requiring concentrated brightness, extended projection, and reliable visual indication. Thanks to its elongated lens structure, this LED delivers improved optical focus compared to standard round LEDs, making it ideal for devices where signal visibility must be maintained at longer distances or through narrow openings.
Engineers, electronics manufacturers, purchasing managers, and system designers choose this 4mm long-lens LED for its strong luminous efficiency, stable performance, and versatility across consumer electronics, industrial equipment, instrumentation, and specialized signaling devices.
Features of the 4mm LED Diode – 12mm Long Lens Type
➤ Extended 12mm Lens for High-Focus Light Projection
The long, cylindrical lens design enhances optical distance and tightens the beam angle, allowing the indicator light to remain clearly visible even through thick panels, pipes, covers, or indicator windows.
➤ Compact 4mm Diameter for Space-Limited Designs
This 4mm package offers a slim form factor, ideal for miniaturized instrument panels, densely packed boards, and compact enclosures.
➤ High Brightness LED Chip
Equipped with efficient LED chips available in multiple colors (Red, Green, Yellow, Blue, White), offering reliable output and stable forward current performance.
➤ Available Lens Types
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Water Clear – For maximum brightness
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Transparent – Balanced clarity and diffusion
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Diffused – Soft, wide-view indicator light
➤ Durable Construction
Designed for applications that require long-term reliability:
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Low power consumption
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Excellent thermal stability
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High mechanical durability
➤ Compliance
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RoHS compliant
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Environmentally safe materials
Applications of the 4mm LED Diode (12mm Long Lens Head)
This LED is widely used across industries that require both compact size and high-focus visibility.
✔ Instrumentation Panels
Ideal for meters, sensors, diagnostic devices, and control instruments requiring clear signal output through panel cutouts.
✔ Industrial Control Systems
Used as a status indicator for:
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Motor controllers
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PLC modules
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Switch panels
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Automation devices
✔ Consumer Electronics
Perfect for compact devices such as:
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Household appliances
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Chargers
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Audio equipment
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Gaming accessories
✔ Communication Equipment
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Network routers and switches
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Signal indicators on communication terminals
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Telecom modules
✔ Medical Devices
Where visual clarity and reliability are essential:
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Diagnostic tools
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Monitoring equipment
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Portable medical devices
✔ Security & Access Control Systems
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Alarm panels
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Door controllers
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Surveillance device indicators
✔ Hobby, DIY, and Educational Electronics
A favorite for:
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Custom lighting
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Breadboard prototypes
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Learning kits and robotics
Benefits & Advantages
➤ Superior Visibility Through Thick or Recessed Panels
The long-lens design ensures the LED protrudes for maximum visibility.
➤ Enhanced Beam Directivity
Reduces lateral light bleed, improving signal clarity in outdoor or high-brightness environments.
➤ Flexible Integration
Compatible with:
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Standard through-hole PCBs
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Panel mounts
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LED housings
➤ Energy Efficient with Long Operating Life
Low current consumption ensures excellent performance even in battery-powered devices.
➤ Multiple Color Options
Useful for multi-status indication systems.
Case Studies
Case Study 1 – Handheld Industrial Tester
A manufacturer of handheld diagnostic testers replaced 3mm LEDs with the 4mm 12mm-lens LED to increase visibility in outdoor conditions. The result:
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40% clearer visibility
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Improved user feedback
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Fewer service complaints
Case Study 2 – Gaming Machine Panel
A gaming equipment company integrated this LED into front-panel indicators:
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Achieved stronger illumination through deep panel structures
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Reduced internal LED count due to improved brightness
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Enhanced user experience and design consistency
User Testimonials
✔ Electronics OEM Engineer – USA
“The 4mm long-lens LED solved our visibility problem on a thick control panel. Bright, consistent, and easy to mount.”
✔ Purchasing Manager – UK
“Good quality and reliable sourcing. The long lens type fits perfectly in devices where traditional LEDs are recessed.”
✔ Product Designer – Europe
“The focused beam makes this LED ideal for compact consumer products. Excellent performance even at low current.”
Conclusion
The 4mm LED diode with a 12mm long lens head is a high-performance indicator LED specifically engineered for applications requiring sharp projection, concentrated brightness, and reliable long-life operation.
Whether used in industrial controls, consumer electronics, communication devices, or specialty signaling systems, this LED provides outstanding visibility and excellent integration flexibility.
If you need dependable, high-focus indication performance in a compact format, this LED diode is the perfect choice for your next design.

Electrical-optical characteristics:
Package configuration & Internal circuit diagram
Obtain 3D specification files
To examine all 3D specifications, save the files to your local drive and open them with your 3D application.
Lens colors in 3D files are solely for visual representation; consult the Datasheet for accurate lens type and color information.
In the event of a mismatch, the dimensions in the datasheet take precedence over the 3D specifications.

All dimensions are in millimeters(inches)
Tolerance is +-0.25(0.01″) unless otherwise note
Specifications are subject to change without notice.
Partno description:
More Information
Lens Color:
| Code | D | T | C | W | E | |
| Meaning | color Diffused | Color Tinted | Water Clear | Water Diffused | Orange diffused |
Absolute maximum ratings (Ta=25°C)
| Parameter | SR | LR | UR | UE | UY | UG | PG | BG | B | UB | UV | W | Unit |
| Forward Current I F | 25 | 25 | 25 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | mA |
| Power Dissipation P d | 60 | 60 | 60 | 65 | 65 | 75 | 110 | 110 | 120 | 120 | 120 | 120 | mW |
| Reverse Voltage V R | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | V |
| Peak Forward Current I PF (Duty 1/10 @1KHZ) | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 100 | 100 | 100 | 100 | 100 | mA |
| Operation Temperature T OPR | -40 to +80 | °C | |||||||||||
| Storage Temperature T STG | -40 to +85 | °C | |||||||||||
| Lead Soldering Temperature T SOL | Max.260+-5°C for 3 sec Max. (1.6mm from the base of the epoxy bulb) | °C | |||||||||||
Related Information
Applied for:




The LEDs described here are intended to be used for ordinary electronic equipment (such as office equipment,
communication equipment and household applications). Consult Betlux’s Sales in advance for information on
applications in which exceptional reliability is required, particularly when the failure or malfunction of the LEDs
may directly jeopardize life or health (such as in aviation, transportation, traffic control equipment, medical
and life support systems and safety devices).
CAUTIONS for Through-Hole LED Lamps
1. Application
The LEDs described here are intended to be used for ordinary electronic equipment (such as office equipment, communication equipment and household applications). Consult Betlux’s Sales in advance for information on applications in which exceptional reliability is required, particularly when the failure or malfunction of the LEDs may directly jeopardize life or health (such as in aviation, transportation, traffic control equipment, medical and life support systems and safety devices).
2. Storage
The storage ambient for the LEDs should not exceed 30℃ temperature or 70% relative humidity. It is
recommended that LEDs out of their original packaging are used within three months
For extended storage out of their original packaging, it is recommended that the LEDs be stored in a sealed
container with appropriate desiccant or in a desiccator with nitrogen ambient.
3. Cleaning
Use alcohol-based cleaning solvents such as isopropyl alcohol to clean the LED if necessary
4. Lead Forming & Assembly
During lead forming, the leads should be bent at a point at least 3mm from the base of LED lens. Do not use
the base of the leadframe as a fulcrum during forming.
Lead forming must be done before soldering, at normal temperature.
During assembly on PCB, use minimum clinch force possible to avoid excessive mechanical stress.


Soldering
When soldering, leave a minimum of 2mm clearance from the base of the base of the lens to the soldering point. Dipping the lens into the solder must be avoided.
Do not apply any external stress to the lead frame during soldering while the LED is at high temperature.
Recommended soldering conditions:
| IR Reflow Soldering (for SMD display) | Wave Soldering | Soldering Iron | |||
| Pre-Heat | 150-180°C | Pre-Heat | 100°C Max. | Temperature | 300°C Max. |
| Pre-Heat Time | 120sec Max. | Pre-Heat Time | 60sec Max. | ||
| Peak Temperature | 260°C Max. | SolderWave | 260°C Max. | Soldering Time | 3sec Max.(one time only) |
| Soldering Time | 10 sec Max. | Soldering Time | 5sec Max. | ||
Note: Excessive soldering temperature and/or time might result in deformation of the LED lens or failure of the LED
ESD(Electrostatic Discharge)
Static Electricity or power surge will damage the LED.
Suggestions to prevent ESD (Electrostatic Discharge):
n Use a conductive wrist band or anti-electrostatic glove when handling these LEDs
n All devices, equipment, and machinery must be properly grounded
n Work tables, storage racks, etc. should be properly grounded
n Use ion blower to neutralize the static charge which might have built up on surface of the LED’s
plastic lens as a result of friction between LEDs during storage and handling
ESD-damaged LEDs will exhibit abnormal characteristics such as high reverse leakage current,
low forward voltage, or “no light on” at low currents. To verify for ESD damage, check for “light on”
and Vf of the suspect LEDs at low currents.
The Vf of “good” LEDs should be>2.0V@0.1mA for InGaN product and >1.4V@0.1mA for AlInGaP
product.

Drive Method
An LED is a current-operated device. In order to ensure intensity uniformity on multiple LEDs connected in
parallel in an application, it is recommended that a current limiting resistor be incorporated in the drive circuit,
in series with each LED as shown in Circuit A below.

When selecting power for LED systems, it’s essential to understand several key parameters to ensure safe operation, longevity, and optimal performance. Here are some steps and considerations for LED power selection:
- Determine the Forward Voltage (Vf) of the LED(s):
Each LED has a forward voltage, which is the voltage at which the LED operates when the current is flowing through it. This value can typically be found in the LED’s datasheet.
- Determine the Forward Current (If) of the LED(s):
The forward current is the current at which the LED is designed to operate. Running an LED at higher than its rated current can reduce its lifespan and increase the heat it produces.
- Decide on the Configuration:
Series Configuration: When LEDs are connected in series, the forward voltages add up, but the current remains the same.
Parallel Configuration: When LEDs are connected in parallel, the forward voltage remains the same, but the currents add up. This configuration can be risky because if one LED fails or has a slightly lower forward voltage, it can cause the other LEDs to draw more current.
Calculate Total Power Requirements:
Power (W) = Total Forward Voltage (V) x Total Forward Current (A)
For example, if you have three LEDs connected in series, each with a forward voltage of 3V and a forward current of 20mA, the total power requirement would be:
Power = (3V + 3V + 3V) x 20mA = 9V x 0.02A = 0.18W
- Select an Appropriate Power Supply:
- Voltage Rating: The power supply voltage should match or slightly exceed the total forward voltage of your LED configuration.
- Current Rating: The power supply’s current rating should meet or exceed the total forward current of your LED configuration.
- Safety Margin: It’s a good practice to select a power supply that can provide at least 20% more power than your calculated requirement. This ensures the power supply isn’t operating at its maximum capacity, which can extend its life and ensure safer operation.
- Consider Additional Features:
- Dimming Capability: If you want to control the brightness of your LEDs, choose a power supply with dimming capabilities.
- Overcurrent and Overvoltage Protection: To protect your LEDs, select a power supply with built-in protection mechanisms.
- Thermal Management: Ensure that the power supply has adequate cooling, especially if it will be enclosed or in a location with limited airflow.
- Regulation and Efficiency:A power supply with good regulation will maintain a consistent voltage output despite variations in the load. High efficiency ensures minimal power is wasted as heat.
- Physical Size and Form Factor:Depending on where you plan to place the power supply, its size and shape may be critical factors.
In summary, when selecting power for LED systems, understanding your LED’s requirements and the configuration you plan to use is essential. Then, pick a power supply that meets those needs with some added safety margin, keeping in mind any additional features or constraints relevant to your project.
Here are some well-regarded brands in the industry:
- Mean Well: One of the most recognized brands in the LED power supply industry, Mean Well offers a wide range of products suitable for both indoor and outdoor applications. Their units often come with features like overcurrent protection, dimming capabilities, and high efficiency.
- Tridonic: A global leader in lighting technology, Tridonic offers LED drivers and power supplies that cater to various lighting solutions, from simple setups to advanced smart lighting systems.
- Philips Advance Xitanium: Philips is a well-known brand in the lighting industry, and their Xitanium series of LED drivers are known for reliability and performance. They cater to both indoor and outdoor LED applications.
- Osram: Another giant in the lighting industry, Osram offers a range of LED drivers and power supplies suitable for various applications, including architectural and street lighting.
- LIFUD: Specializing in LED drivers, LIFUD is known for its high-quality products that cater to both commercial and residential LED lighting solutions.
- MOSO: This brand offers a variety of LED drivers, especially for outdoor and industrial applications. Their products are known for durability and performance.
- TDK-Lambda: With a history in power electronics, TDK-Lambda offers a range of power supplies and LED drivers suitable for various applications, emphasizing reliability and advanced features.
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