What Are the Main LED Wavelengths
June 25, 2026
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Source: lideda
LEDs (Light Emitting Diodes) are available across a wide range of wavelengths, from ultraviolet (UV) through the visible spectrum and into the infrared (IR). Each wavelength produces a different color or invisible light and is selected based on its intended application.
Main LED Wavelength Ranges
| LED Color | Typical Wavelength | Visible? | Common Applications |
|---|---|---|---|
| Ultraviolet (UV) | 265–405 nm | No | Sterilization, curing, fluorescence |
| Violet | 405–430 nm | Yes | Special lighting, entertainment |
| Blue | 450–470 nm | Yes | General lighting, displays, plant lighting |
| Cyan | 490–505 nm | Yes | Medical devices, decorative lighting |
| Green | 520–535 nm | Yes | Traffic signals, indicators, displays |
| Lime | 560–575 nm | Yes | High-CRI lighting, stage lighting |
| Amber | 585–595 nm | Yes | Automotive lighting, warning lights |
| Orange | 600–610 nm | Yes | Signal lighting, indicators |
| Red | 620–630 nm | Yes | Displays, indicators, decorative lighting |
| Deep Red | 650–670 nm | Yes | Horticulture, photobiomodulation |
| Near Infrared | 730–940 nm | No | Remote controls, security, sensing |
Visible LED Wavelengths
1. Violet (405–430 nm)
Violet LEDs emit the shortest visible wavelengths. They are commonly used for fluorescence excitation, entertainment lighting, and specialized industrial inspection.
2. Blue (450–470 nm)
Blue LEDs are among the most widely manufactured LEDs. They are the foundation of white LED lighting because a blue chip combined with phosphor creates white light. They are also widely used in displays, automotive lighting, and plant growth systems.
3. Green (520–535 nm)
Green LEDs provide high visibility to the human eye, making them popular in traffic lights, electronic indicators, signage, and display panels.
4. Amber (585–595 nm)
Amber LEDs produce a warm yellow-orange light that is highly visible in adverse weather. They are commonly found in automotive turn signals, hazard lights, and industrial warning equipment.
5. Red (620–630 nm)
Standard red LEDs are used extensively in indicator lamps, digital displays, decorative lighting, and electronic equipment.
6. Deep Red (650–670 nm)
Deep red LEDs, especially 660 nm, are essential for horticultural lighting because chlorophyll absorbs this wavelength efficiently. They are also widely used in red light therapy systems.
Ultraviolet LEDs
UV LEDs emit wavelengths below the visible spectrum.
| Wavelength | UV Type | Typical Uses |
|---|---|---|
| 265–280 nm | UV-C | Water and air sterilization |
| 310–340 nm | UV-B | Medical and research applications |
| 365–395 nm | UV-A | UV curing, counterfeit detection, fluorescence |
UV LEDs have largely replaced traditional mercury lamps in many curing and inspection applications due to their compact size, energy efficiency, and long service life.
Infrared LEDs
Infrared LEDs emit light invisible to the human eye.
| Wavelength | Typical Application |
|---|---|
| 730 nm | Horticulture far-red lighting |
| 810 nm | Medical and therapy equipment |
| 850 nm | Night vision cameras |
| 940 nm | TV remote controls, motion sensors |
Among these, 850 nm offers higher camera sensitivity for night vision, while 940 nm provides less visible red glow, making it suitable for covert surveillance and sensing.
Choosing the Right LED Wavelength
The best wavelength depends on the application:
265–280 nm: UV disinfection
365–395 nm: UV curing and inspection
450–470 nm: White lighting and displays
520–535 nm: Signage and indicators
585–595 nm: Automotive warning lights
620–630 nm: General red illumination
660 nm: Plant growth and red light therapy
730 nm: Flowering control in horticulture
850 nm: Night vision systems
940 nm: Remote controls and proximity sensors
Why Wavelength Matters
LED wavelength determines more than just color—it influences energy, visibility, material interaction, and biological response. For example:
Shorter wavelengths (UV and blue) carry more photon energy and are effective for curing, sterilization, and fluorescence.
Mid-range wavelengths (green and amber) maximize human visual sensitivity, making them ideal for signaling.
Longer wavelengths (red and infrared) penetrate biological tissue more effectively and are widely used in horticulture, sensing, and medical applications.
As LED manufacturing continues to advance, precise wavelength selection allows designers to optimize efficiency, performance, and application-specific results across industries ranging from general lighting and automotive systems to agriculture, healthcare, and industrial automation.
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