4-Channel Collimated LED Source


4-Wavelength High-Power LED Source

  • 4-Wavelength LED Source with Stable and Repeatable Emission
  • LED Switching Controlled via Current
  • Choose from 14 LEDs
  • Liquid Light Guide and Microscope Adapters Available


  • User-Configurable 4-Wavelength Source
  • Precisely Defined Spectral Range
  • Switching and Intensity Adjustments via LED Current Settings
  • High Emission Stability and Reproducibility
  • High Thermal and Mechanical Stability
  • No Moving Parts for Vibration-Free Operation
  • Long Lifetime Light Source (See the Specs Tab for Details)
  • Optional Adapters for Olympus, Nikon, Zeiss, and Leica Microscope Lightports
  • Optional Adapter for Coupling to Liquid Light Guides (LLGs)

The LED4D 4-Wavelength High-Power LED Sources are ideal for applications requiring up to four wavelengths of high-performance light. These user-configurable light sources efficiently combine the output of all four LEDs into a single collimated beam. Together with a DC4100 or DC4104 4-Channel LED Driver, the LED4D provides a reliable, versatile light source with LED switching and accurate modulation of each individual LED. The source is vibration free, easy to operate, and has a long lifetime .

Compared to conventional, non-LED sources such as halogen and gas discharge lamps, these 4-wavelength sources offer many advantages such as higher signal-to-noise ratios (due to narrow bandwidth emission), better stability, longer life, lower replacement costs, simple operation without maintenance cycles, and no active cooling requirements or thermal filtering due to minimal thermal loads. The operating wavelength and intensity can be set quickly via the DC4100 or DC4104 driver front panel or USB connection, making this source an ideal choice for microscopy applications where multiple wavelengths are required. The source can also be modulated using the BNC input modulation connection on the DC4100 or DC4104.

The LEDs incorporated into these sources are characterized by high divergence. The light is guided through the system using mirrors, and the output is collimated with an aspheric condenser lens. This setup inherently leads to a reduction in the measured output power (as seen in the table to the right) compared to that of the bare LEDs. Thorlabs also offers single-channel collimated LEDs, which have higher power outputs since wavelength combining optics are not needed.

Optional adapters are available for using the 4-wavelength LED source with liquid light guides or microscopes. The output aperture of these LED sources is internally SM2 (2.035"-40) threaded. For Olympus, Nikon, Zeiss, and Leica microscopes, adapters are available that directly mount the 4-wavelength sources onto the microscope lightport (see SM2-Threaded Microscope Adapters).

Alternatlively, the LED4B1 Adapter for Liquid Light Guides (LLGs) is used to couple light exiting the LED source into a LLG. It replaces the SM2-threaded output port with an aperture that is internally SM1 (1.035"-40) threaded. The adapter contains a collimating optic designed to focus light into the aperture of a LLG held by the appropriate LLG-to-SM1 adapter (AD3LLG for Ø3 mm core LLGs or AD5LLG for Ø5 mm core LLGs).

LED Options

Output Powera
365 nm UV 85 mW
385 nm UV 95 mW
405 nm UV 290 mW
420 nm Violet 30 mW
455 nm Royal Blue 310 mW
470 nm Blue 250 mW
490 nm Blue 50 mW
505 nm Cyan 170 mW
530 nm Green 100 mW
565 nm Green Yellow 35 mW
590 nm Amber 65 mW
617 nm Orange 210 mW
625 nm Red 240 mW
660 nm Deep Red 210 mW
  • Power output from 4-wavelength source using this LED.
General Specifications
Operating Temperature Rangea 0 °C to 40 °C (32 °F to 104°F)
Storage Temperature Range -40 °C to 70°C (-49 °F to 158 °F)
Dimensions (W x H x D) 164 mm x 150 mm x 57 mm (Without Cable)
(6.46" x 5.91" x 2.24")
Front Aperture Thread Internal SM2 (2.035"-40)
Weight 1.6 kg (3.5 lbs)
  • Non-Condensing


4-Wavelength LED Source

To access the part number, documentation, and pricing for a 4-wavelength source, select four wavelengths in the configurator below. Pricing is identical regardless of the combination chosen, but part number will vary.


Externally SM2-Threaded Microscope Adapters

Compatible Microscope Olympus Leica Zeiss Nikon Eclipse


Internally SM1-Threaded Adapter for Liquid Light Guides


Output Power of 4-Wavelength LED Source with Liquid Light Guide Attached
LED Nominal
Power through LLG LED Nominal
Power through LLG
Ø3 mm Core,
6' (1.8 m) Long
Ø5 mm Core,
4' (1.2 m) Long
Ø3 mm Core,
6' (1.8 m) Long
Ø5 mm Core,
4' (1.2 m) Long
365 nm 35 mW 110 mW 505 nm 70 mW 150 mW
385 nm 65 mW 120 mW 530 nm 15 mW 55 mW
405 nm 110 mW 330 mW 565 nm 15 mW 30 mW
420 nm 5 mW 20 mW 590 nm 20 mW 45 mW
455 nm 105 mW 250 mW 617 nm 80 mW 150 mW
470 nm 105 mW 275 mW 625 nm 100 mW 200 mW
490 nm 10 mW 30 mW 660 nm 100 mW 190 mW

The LED4B1 Adapter for Liquid Light Guides contains a collimating aspheric lens (ACL2520-A) to focus light from the 4-wavelength LED source into a liquid light guide (LLG) held in the appropriate LLG-to-SM1 adapter (not included). The internally SM1-threaded output port of the LED4B1 accepts the AD3LLG SM1 adapter for Ø3 mm core LLGs or AD5LLG SM1 adapter for Ø5 mm core LLGs.

The LED4B1 has the same bolt pattern as the the 4-wavelength source's SM2-threaded collimating output port. To install, simply remove the SM2-threaded output port by unscrewing the four M2.5 screws and attach the LED4B1 adapter in its place using the same four screws.


Advanced 4-Channel LED Driver


* 4-Channels with Precise and Individual Current Adjustment
* Modulation Frequency: 0 - 100 kHz
* LED Current: 1 A (Max)
* Driving Voltage: 5 V (Max)
* External Modulation: 0 - 10 V
 * Precise Intensity Adjustment
The DC4100 Series LED Driver is designed to conveniently control the LED4D Sources.


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