Mightex Multi-Wavelength Fiber-Coupled LED Sources

(up to 8 wavelengths)

Mightex WFC-series multi-wavelength fiber-coupled light sources are enabled by the latest LED technologies, and Mightex’s proprietary beam combining and coupling optics.

4-Wavelength WFC


Up to eight (8) LEDs are coherently combined into a single multi-mode fiber with the highest efficiency practically possible. Each LED can be powered individually or simultaneously to produce a tunable spectrum.

The light sources are offered in two configurations: the standard configuration and the high-power configuration. Neutral beam combiners are used in the standard configuration. The standard configuration has the advantage of low cost and the most flexible wavelength plans. Any wavelength and white color may be combined in the standard configuration. For applications that require the highest possible output power, however, one should choose the high-power configuration where high-efficiency dichroic beam splitters are used to combine different wavelengths. Because not all possible dichroic beamsplitters are in stock, some wavelength combinations may require customization. Please contact us with your detailed wavelength plan to obtain a quotation for custom higher-power configurations.

A wide range of LED wavelengths from 365nm to 940nm and white colors are available for users to choose from. The selected LEDs are installed in the light source chassis in the factory. Fiber coupling is through a standard SMA port, and hence customers may use different fibers with the LED source according to the specific requirements of their applications. SMA-connectorized fiber patchcords are available in various core diameters and numerical apertures.

A 4-channel light source includes a 5-ft electrical cable, and an 8-channel source includes two such cables. Each cable has an 8-pin locking connector on one end to be plugged into the light source, and four pairs of bare-wire terminals at the other end. Each pair of terminals should be connected to a separate channel of a LED controller. Users can drive the installed LEDs individually or simultaneously using a Mightex multi-channel LED controller or other constant current sources. A cooling fan with heat sinks is built into the light source. When two or more wavelengths are running at full power, the fan should be turned on to maintain low temperature of the LED junctions, in order to prevent LED damage due to over-heating. A separate power supply is included for driving the cooling fan.

Mightex 4-channel multi-wavelength light source can be ordered with 2 and 4 wavelengths, and the 8-channel source can be ordered with 6 and 8 wavelengths. In the standard configuration (which is NOT supported by the 8-channel source due to low efficiency), output power of each wavelength decreases with the total number of wavelengths, while in the high-power configuration the output power does not change much with number of wavelengths.


Mightex Fiber Coupled LEDs Video Guide

Video: Multi-Wavelength Beam Combiners for LED Collimator Sources


IMPORTANT : (1) LED’s can ONLY be driven by a constant-current source, and NOT a voltage source (e.g. a battery, or a AC/DC power supply etc.); (2) Please always verify LED’s current rating first before applying current to the LED, and please always make sure NOT to apply current that is above the LED’s current rating.



  • Combine 2, 4, 6 or 8 LEDs into a single fiber output
  • No moving parts in optical path
  • Interchangeable fiber with SMA connector
  • Independent and simultaneous control of the LED’s
  • High efficiency dichroic beam combiners
  • Wide range of available wavelengths: UV/VIS/NIR and white
  • Cooling fan for maximum intensity stability
  • Optional multi-channel LED controller


  • Optogenetics
  • General purpose light source
  • Microscope illuminator
  • Fast spectrum tuning



Click here to download datasheet (form manufacturer's website.)



High Power Fiber-Coupled LED Light Sources

Mightex FCS-series fiber-coupled LED light sources employ the latest high-power LED technologies and a proprietary coupling optics to achieve maximum optical output power. Optical output is coupled into a fiber through a standard SMA fiber adaptor port (SMA fiber patch cords are sold separately). FCS series also features a locking electrical connector for secured connection. FCS series are designed as a universal light source for general lab use and OEM applications. The one-piece machined housing features multiple mounting holes. All Mightex LED drivers such as the SLC series or other LED drivers and current sources can be used to drive the light sources.


Selecting a Microscopy LED Light Source

1. Select LED Wavelength

Emission Spectra
Multiple Available Wavelengths  (Click to enlarge. Also see: Specification Sheet; Manufacturer's website)



2. Select LED Configuration


Mightex Microscope LED Light Source Configuration
Single-Wavelength:      Type A, Type B, Type J & Type H



Mightex Microscope LED Light Source Configuration
Multi-Wavelength:       Type A, Type B, Type J & Type H



Mightex Microscope LED Light Source Configuration
Wavelength-Switchable:     Type A



3. Select LED Controller

Mightex Microscope LED Light Source Controller Option
Manual/Analog:       BLS-1000-2, BLS-3000-2, BLS-13000-1, and BLS-18000-1


Mightex Microscope LED Light Source Controller Option
Manual/Software/Analog/TTL          BLS-IO04-US



4. Microscope Coupling

Microscope adapters are available for all major manufacturers (Nikon, Olympus, Leica, Zeiss). If you have a different microscope, please contact us.

Mightex Microscope LED Light Source Configuration


Mightex Microscope LED Light Source Configuration
Lightguide-Wavelength Microscopy



LED Application Examples

Abdelfattah AS et al., Bright and Photostable Chemigenetic Indicators for Extended In Vivo Voltage Imaging – Science (2019)
Abdelfattah et al., developed novel chemigenetic indicators for in vivo voltage imaging in neurons. To illuminate their indicators, the group used Mightex’s Microscope LEDs.

Crandall SR, et al.,  Infrabarrels Are Layer 6 Circuit Modules in the Barrel Cortex that Link Long-Range Inputs and Outputs – Cell Reports (2017)
In this work, Crandall et al., used Mightex’s Microscope LEDs to optically stimulating different neuronal pathways connecting to pyramidal neurons found in L6 of the whisker somatosensory cortex of mice.

Higgs MH, Measurement of Phase Resetting Curves Using Optogenetic Barrage Stimuli – Journal of Neuroscience Methods (2017)
To study phase resetting curves in vivo, Higgs and Wilson used Mightex’s Microscope LEDs to establish whether their novel method of optogenetic barrage stimulation would work during extracellular spike recordings (a recording method often used in in vivo experiments).



Also See:


Microscopy LEDs

by Mightex
(manufacturer's website)




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