Lambda FLED

Fluoreszenz-Lichtquelle (Sutter Instrument)


The Lambda FLED was designed as a high-power LED driver for fluorescence microscopy. Based on our proven TLED+ design, the FLED has been optimized for single-channel, high-current LEDs used as excitation light sources.

The basic system consists of an LED mounted on a special black-anodized aluminum heat sink and a controller. The controller is CNC machined from solid aluminum billet, and powered by a rugged modular universal power supply. The FLED provides intensity control and on-off control via a toggle switch or TTL logic. The on-off time is less than 25 µs when using TTL control. In addition to digital input control, the Lambda FLED has an analog input to modulate the LED intensity. The Lambda FLED is expected to have stable output that will last more than 50,000 h.

The Lambda FLED can be ordered with several different wavelength-specific LEDs that range from 365nm to 940nm. Please call us if you require a wavelength that is not listed.

Our dual channel Lambda FLED option combines two high power LEDs into a single light path. The FLED-DC allows the use of two channels for fluorescence imaging. Both channels are driven by individual FLED controllers and can be triggered, also individually, by a TTL signal. For greater than two LEDs in a setup, please see our Lambda 421 or Lambda OBC.

1 A

Wavelength options
340, 365, 385, 410, 440, 460, 480, 506, 530, 561, 590, 630, 660, 740, 850, 940 nm
Other wavelengths available upon request

External Control
Digital (BNC) / Analog (SMA)

Each Lambda FLED system includes an optical mounting adapter for the excitation port of the microscope and detailed installation instructions. Mounting adapters are designed to fit most models of Nikon, Olympus, Zeiss and Leica microscopes. Custom adapters are available at an additional cost.



  • > 50,000 h lifetime
  • < 25 µs ON-OFF time
  • TTL control (with polarity switch)
  • Very stable output
  • Compact stand-alone design
  • Easy installation



  • Fluorescence microscopy
  • Ultra high speed wavelength selection (FLED-DC)



Output Range
White light (400 nm - 700 nm)

Noise/Short term stability
0.01 %

LED Life
> 50,000 h

Control Box Dimensions
10.2 cm × 8.3 cm x 10.2 cm

1.0 kg

120/240 V
50/60 Hz power line
75 W max