3.5mmx2.8mm SMD, horticulture LED,660nm

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"Revolutionizing Plant Growth: The Impact of  3.5mm x 2.8mm SMD Horticulture LED, 660nm"
Introduction In the innovative world of plant cultivation, the emergence of the 3.5mmx2.8mm SMD horticulture LED, operating at 660nm, marks a significant leap forward. These compact, powerful lights are not just changing how we approach horticulture; they're redefining it. Tailored for both the seasoned engineer in electronics and the astute purchaser, this article delves into the features, applications, benefits, and real-world testimonials of this groundbreaking technology. Features of the 3.5mmx2.8mm SMD Horticulture LED, 660nm The 3.5mmx2.8mm SMD horticulture LED is a marvel of modern engineering. Its compact size belies its power, with the 660nm wavelength being particularly effective for plant growth. This specific wavelength falls within the red light spectrum, which is crucial for photosynthesis and plays a vital role in plant development and flowering. The small size of the LED makes it versatile for various applications, from large-scale agricultural projects to smaller, in-home green spaces.
  1. Targeted Red Spectrum: Specifically designed to emit light at a wavelength of 660 nanometers, targeting the red spectrum is crucial for stimulating photosynthesis and promoting flowering in plants.
  2. Energy-efficient: consumes minimal power while producing high-intensity light, providing a cost-effective lighting solution for horticultural applications.
  3. Long Operational Lifespan: Durable and long-lasting, reducing the need for frequent replacements and lowering maintenance costs over time.
  4. Precision and Customization: Many models offer customizable light output and spectral distribution, allowing for fine-tuning of lighting conditions to meet the specific needs of different plant species and growth stages.
  5. Advanced Heat Management: Engineered with efficient heat dissipation systems to maintain optimal operating temperatures, safeguarding the longevity and performance of the LEDs.
Applications in Horticulture These LEDs are finding their place in a multitude of horticultural settings. Their efficacy at the 660 nm red light wavelength makes them perfect for boosting growth in greenhouse environments, enhancing flowering in commercial flower farms, and improving yield in indoor vegetable cultivation. In vertical farming systems, their compact size allows for dense installation, maximizing space efficiency and light distribution.
  1. Indoor Horticulture: Ideal for use in grow rooms, vertical farms, and hydroponic systems to provide targeted red light for promoting plant growth, flowering, and overall development.
    Indoor Horticulture
    Indoor Horticulture
  2. Commercial Horticulture: Widely used in large-scale greenhouse facilities to support plant growth and optimize crop yields, offering a reliable and efficient means of providing supplemental or primary lighting.
    Commercial Horticulture
    Commercial Horticulture
  3.  Home Gardening and Hobbyist Use: Suitable for creating tailored lighting environments for indoor plants, whether used as standalone lighting or in conjunction with natural sunlight to support healthy growth and flowering.
  4. Research and Experimentation: Utilized in scientific research, plant growth studies, and experimental horticultural projects to investigate the effects of specific light spectra on plant physiology and development.
    Research and Experimentation
    Research and Experimentation
  5. Urban Agriculture and Vertical Farming: Crucial for indoor farming initiatives in urban environments, enabling efficient cultivation of crops in vertical farming systems, indoor gardens, and other urban agricultural settings.
    Urban Agriculture and Vertical Farming
    Urban Agriculture and Vertical Farming
  6. Medicinal Plant Cultivation: Beneficial for cultivating medicinal plants, promoting the development of bioactive compounds, and enhancing the medicinal properties of specific plant species.Medicinal Plant Cultivation
  7. Sustainable Agriculture: Contributes to sustainable agricultural practices by enabling efficient year-round cultivation, reducing reliance on traditional energy-intensive lighting systems, and supporting the production of high-quality, locally grown produce.
  8. Sustainable Agriculture
Benefits and Advantages One of the standout benefits of these LEDs is their energy efficiency. They consume significantly less power than traditional lighting systems, making them an eco-friendly choice for horticulture. Their durability and long lifespan mean lower maintenance costs and fewer replacements. For the engineer and administrator focused on cost-effective solutions, these attributes translate to a sound investment in sustainable agriculture. Case Studies and User Testimonials In a case study conducted in a hydroponic lettuce farm in the USA, replacing traditional grow lights with these 3.5mmx2.8mm SMD LEDs resulted in a 25% increase in yield and a 40% reduction in energy costs. A flower grower in the UK noted that since switching to these LEDs, the flowering time has reduced by two weeks, with a notable improvement in bloom quality. These testimonials underscore the real-world efficacy of the 660nm LEDs in enhancing horticulture practices.
vertical farm in USA
vertical farm in USA
Conclusion and Call to Action The 3.5mmx2.8mm SMD horticulture LED at 660nm is not just a lighting solution; it's a transformative tool for the horticulture industry. For engineers, purchasers, and administrators in the USA and UK, adopting this technology means embracing efficiency, sustainability, and profitability. The time to revolutionize your plant growth approach with these LEDs is now.    
  • Electrical-optical characteristics: (Ta=25°C) (Test Condition: IF=60mA)
Part Number Chip Lens Type Forward Voltage(VF) Unit:V Flux Unit:lm   Viewing Angle 2θ1/2 (deg)
Emitted Color lP (nm)
Typ Max Min. Typ.
BL-LS3528C1S3URC-660 Ultra Red Made in Taiwan 660 Water Clear 2.10 2.50 2 4 110
  • Absolute maximum ratings (Ta=25°C)
Parameter Rating Unit
Forward Current  IF 90 mA
LED Junction Temperature 60 °C
Peak Forward Current IPF (Duty 1/10 @1KHZ) 300 mA
Operation Temperature TOPR -40 to +100 °C
Storage Temperature TSTG -40 to +100 °C
Lead Soldering Temperature TSOL   Max.260±5°C for 3 sec Max. (1.6mm from the base of the epoxy bulb) °C

RoHs Compliance, Pb-free              Anti-Static Attention

Electrical-optical characteristics:
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More information, Contact us at sales@betlux.com
Package configuration & Internal circuit diagram
product detail-LEDs 202311-Discrete LEDs Package

All dimensions are in millimeters(inches)
Tolerance is +-0.25(0.01″) unless otherwise note
Specifications are subject to change without notice.

Partno description:

LEDs, Light Emitting diodes, which include various small kinds, such as 3mm, 5mm, 8mm, 10mm; round type, rectangular type square type, tower type, Oval led, elliptical, flat top; SMDs, high power led, piranha LEDs

Part No of  LED diode

More Information

Lens Color:

Meaningcolor DiffusedColor TintedWater ClearWater DiffusedOrange diffused 

Absolute maximum ratings (Ta=25°C)

Forward Current I F252525303030303030303030mA
Power Dissipation P d606060656575110110120120120120mW
Reverse Voltage V R555555555555V
Peak Forward Current I PF (Duty 1/10 @1KHZ)150150150150150150150100100100100100mA
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:
auto lampcameradome lightrgb screentraffic light


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.

led diode formingassembly notice of led diode


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 SolderingSoldering Iron
Pre-Heat150-180°CPre-Heat100°C Max.Temperature300°C Max.
Pre-Heat Time120sec Max.Pre-Heat Time60sec Max.
Peak Temperature260°C Max.SolderWave260°C Max.Soldering Time3sec Max.(one time only)
Soldering Time10 sec Max.Soldering Time5sec 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


antistatic notice-smd led

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.

drive notice - led diode

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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