Posted in | Light Sources

LED Light Sources for Optical Microscopy – Lambda TLED / TLED+

The Lambda TLED and TLED+ are stand-alone LED light sources that are capable of being used with the transmitted light path of a microscope or in various other applications with similar requirements.

The basic system comprises of an LED mounted on a controller and a special black-anodized aluminum heat sink. Both TLED+ and TLED controllers are powered by a rugged modular universal power supply.

Intensity control and on-off control are provided by the controllers via a toggle switch or TTL logic. When using TTL control, the on-off time is < 25 µsecs.

In addition to digital input control, the Lambda TLED+ has an analog input to modulate the LED intensity. The Lambda TLED and TLED+ are expected to have stable output that will last in excess of 50,000 hours.

The Lambda TLED and TLED+ can be ordered with a high-output white light LED making it an ideal light source for contrast methods including Phase and Differential Interference Contrast (DIC).

As an alternative to the conventional white-light LED, Sutter Instrument provides a wide range of options including an IR-LED, which is ideal for experiments requiring IR-DIC.

The dual channel Lambda TLED+ option combines two high power LEDs into a single light path. The TLED-DC comprises of a 460 nm LED for stimulation, while the second channel passes the phosphor emission from a white light LED.

The white light channel can be used to access spectra between 510 nm to 630 nm and is suitable for a range of applications. Both channels are driven by individual TLED+ controllers and can also be individually triggered by a TTL signal. Alternate wavelength configurations are available.

TLED / TLED+ Comparison

Product Current (A) Wavelength options (nm)* External Control
TLED 1 White, 405 nm, 460 nm, 505 nm, 530 nm, 624 nm, 660 nm 740 nm, 850 nm, 940 nm Digital (BNC)
TLED+ 5 White, 365 nm, 385 nm, 460 nm, 530 nm, 624 nm Digital (BNC) / Analog (SMA)

* other wavelengths available upon request

Each Lambda TLED/TLED+ system comprises of an optical mounting adapter for the microscope and detailed installation instructions. Mounting adapters are designed to fit most models of Zeiss, Olympus, Nikon and Leica microscopes. Custom adapters for the Lambda TLED/TLED+ are also available.

Download the Brochure for More Information


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

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