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T-Cube LED Driver

  • LED Current up to 1200 mA
  • Modulation up to 5 kHz
  • Trigger Mode up to 1 kHz
  • Adjustable LED Current Limit


Power Supply
Sold Separately

Application Idea

Multiple High-Power LEDs
and Drivers Being Used
in the Same Application

Related Items

Please Wait
LED Controller Selection Guide
Type Max Number
of LEDs
USB Compatible
T-Cube Driver
1 1.2 A 0 - 5 kHz No Mounted
Fiber Coupled
PCB Mounteda
4 1 A 0 - 100 kHz Yes
Solis™ LED
1 10 A 0 - 1 kHz No High Power
1 10.0 A 0 - 250 kHz Yes High Power
Fiber Coupled
PCB Mounteda
  • Requires the CAB-LEDD1 cable.
T-Cube Light Source & Driver Modules
Laser Diode Driver
Laser Sources
LED Driver

Click to Enlarge

Back View of the LEDD1B T-Cube. For more information, please see the Pin Diagrams tab.

Click to Enlarge

Top View of the LEDD1B T-Cube


  • Easy-to-Use LED Driver
  • 3 Operation Modes:
    • Constant Current Mode
    • Modulation Mode
    • Trigger Mode
  • Compact Footprint Measuring 60 mm x 60 mm x 47 mm (2.4" x 2.4" x 1.8")
  • Pulse Width and Frequency Control via External 0-5 V Signal
  • Adjustable LED Current Limit
  • Includes One CAB-LEDD1 Cable (Additional Cables Available Separately Below)

The LEDD1B driver is designed to drive high-power LEDs with currents up to 1200 mA. It features an adjustable LED current limit to protect the connected LED. The output current can be limited continuously from 200 mA to 1.2 A using the adjuster on the front of the unit (shown below), thereby ensuring the output current does not exceed the limit regardless of the other settings or the modulation input voltage.

Current Limit Adjuster

The LEDD1B is compatible with our high-power LEDs, which are available in collimated, uncollimated, PCB-mounted, and fiber-coupled versions. It is also compatible with select unmounted LEDs offered by Thorlabs for which the maximum forward DC current is higher than 200 mA. When driving these LEDs, care must be taken to ensure the LEDD1B current limit is set at or below the LED's maximum forward DC current rating. Set the current limit (see left) by rotating the arrow direction with a flathead screwdriver.

The LEDD1B driver offers three operation modes: constant current mode, trigger mode, and modulation mode. The trigger and modulation modes are controlled by an external voltage in the 0 to 5 V range. When in the modulation mode, the LED current output exactly follows the amplitude and waveform of the input signal independent of the knob settings on the top of the T-Cube control unit. In trigger mode the output current switches to the level that has been selected by the knob on the top of module as soon as a threshold voltage is reached. This can be used for pulse width modulation (PWM). The threshold voltage is fixed and cannot be changed by the user. The operation mode can be changed by a switch next to the current selector knob.

This LED Driver has the same compact form factor as other T-Cube modules, and thus, it integrates well into the platform. It is shipped attached to a removable base plate, which allows the T-Cube to be easily secured to an optical table.

Multi-LED Source
A customizable multi-LED source, such as that featured in the Application Idea tab here, may be constructed using our mounted high-power LEDs and other Thorlabs items. This source may be configured for integration with Thorlabs' flexible SM1 Lens Tube Systems, 30 mm Cage Systems, and microscope adapters. Please see our mounted high-power LEDs presentation for a detailed item list and instructions. Thorlabs also offers integrated, user-configurable 4-Wavelength LED Sources thay can be driven using our four-channel LED drivers.


The LEDD1B is designed for high-brightness LEDs only. The LED current limit has to be adjusted by the trim pot on the front of the unit so that the maximum current of the connected LED will not be exceeded. The available range for this limit is 200 to 1200 mA.

Power Supply Options

The preferred power supply (single channel or hub-based) depends on the end user's application and whether you already own compatible power supplies. To that end and in keeping with Thorlabs' green initiative, we do not ship these units bundled with a power supply. This avoids the cost and inconvenience of receiving an unwanted single-channel supply if a hub-based system would be more appropriate. The power supply options compatible with the LEDD1B LED Driver are listed below.

Compatible Thorlabs LEDs
(Click for Link)
Collimated LED Mounted LED Fiber-Coupled LED Metal-Core PCB LED
LED Description Collimated
Fiber Coupled
PCB Mounteda
  • Requires the CAB-LEDD1 cable, included with the LEDD1B. Additional CAB-LEDD1 cables are available below.
Common Data
Output Current Range0 - 1200 mA
LED Current Limit Set Point Range200 - 1200 mA
LED Forward Voltage11 V (Min)
12 V (Typical)
Current Ripple8 mA
Current Ripple Frequency570 kHz
Modulation Modea
Frequency Range0 - 5 kHz, Sine Wave
Modulation FormArbitrary
Input Voltage Rate0 - 5 V
Slew Rate13.6 mA/µs
Decay Rate13.1 mA/µs
Trigger Modea
Frequency Range0 - 1 kHz
Duty Cycle Range20 - 80% @ 1 kHz
2 - 98% @ 100 Hz
0.2 - 99.8% @ 10 Hz
Modulation FormSquare Wave / PWM
Logic Input LevelsTTL
Min H-Level: 2 V
Max L-Level: 0.55 V
Slew Rate18 mA/µs
Rise Time51 µs
Decay Rate12 mA/µs
Fall Time79 µs
General Data
Power Supply15 VDC
Maximum Power Consumption15 VA
Operating Temperature0 - 40 °C
Storage Temperature-40 to 70 °C
Weight240 g
Dimensions (W x H x D)60 mm x 73 mm x 104 mm
  • Specifications for the modulation and trigger modes depend on the forward voltage and capacitance of the connected LED.

All the technical data is valid at 23 ± 5 °C and 45 ± 15% relative humidity.

LED Connector - Female

PINout details for LED connector

1LED Anode
2LED Cathode

Modulation In

BNC Female

BNC Female

0 to 5 V external LED control.

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Posted Comments:
Posted Date:2017-11-12 07:25:32.007
What is the type of the power plug connector needed to power up the unit with a custom power supply? E.g. what is the diameter of the central pin?
Posted Date:2017-11-16 03:55:45.0
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. The diameter of the pin is 1.3 mm. I will contact you directly for further assistance.
Posted Date:2017-07-09 23:23:47.383
Can the T-cube driver supply a single LED with a forward voltage of 15 V? In the Spec I don't understand clearly the lowest and highest supported forward voltages.
Posted Date:2017-07-10 02:07:57.0
This is a response from Wolfgang at Thorlabs. Thank you very much for your inquiry. The LED forward voltage given in the specs of the LEDD1B is the maximum voltage it can supply. So the LEDD1B works up to minimum 11 V, typically 12 V. An LED with 15 V forward voltage couldn't be operated at full power. I will contact you directly to provide further assistance.
Posted Date:2017-06-27 14:04:14.82
I'd like to push the output current right up to my LED's maximum rating (1 A), but I'm a bit worried of under or overshooting it with the manual pot. Secondly, I'm putting together two identical systems, so I would like to make sure I have both LED's operating with the same current input. Is there a straightforward way of measuring the pot's resistance or the current output to ensure calibration between two T-cube drivers? Of course, I will check the LED light output for calibration (which is probably a good way of going about it since I doubt two LEDs are exactly the same), but that doesn't help with the under/overshoot problem. Thanks. -Matt
Posted Date:2017-06-29 05:12:03.0
This is a response from Wolfgang at Thorlabs. Thank you very much for your inquiry. You can set the current limit of the LEDD1B driver on the potentiometer on the front. This will be the maximum current the LEDD1B will provide in CW and trigger mode. To make sure that you stay below a critical current with this setting you could e.g. attach a resistor with a resistance similar to your LED and measure the current going through it. You can use the connection cable CAB-LEDD1 for this. The pin diagrams can be found on the website. Please make sure to take the necessary precautions as the current provided by the LEDD1B is quite high. The best way to get the same power out of two LEDs is to measure the power emitted by the LEDs and to adjust the currents through the LEDs accordingly. Just like you mentioned two LEDs will never be exactly the same so simply applying the same current wouldn't be enough. I will contact you directly to provide further assistance.
Posted Date:2017-04-11 17:31:06.313
We have been using flashlamps for many years (since 1976!) to generate 1 ms blue or UV flashes. We typically dump 200 J (!!) into a 75 W xenon short-arc lamp, and we get ~ 100 mJ of photons. The frequency is ~ 0--that is, every 30 s or so. For most applications, we could focus a laser down to a spot a few microns in dia. However, for other examples, we need a spot ~ 1mm in dia, which is why we need ~ 100 mJ. Can we do this with LEDs? 10 ms would be OK, too. Your power supply delivers 10 V x 1 A = 10 W, so 100 mW would take 10 ms. However, output light would be much less. This takes a phone call--not a boilerplate email from your technical department. Henry A. Lester, Caltech
Posted Date:2017-04-12 03:13:38.0
This is a response from Wolfgang at Thorlabs. Thank you very much for your inquiry. What you wrote is correct, the main limitation for your application is the light output of the LEDs. Depending on the spectral range in the blue and UV, the LEDs will emit between 10mW and roughly 1000mW. This means that it will take at least 100ms to get 100mJ of energy. We will contact you directly to talk about your application in more detail.
Posted Date:2017-01-16 15:32:52.6
Is the BNC only for modulation or can it be used for current control using an arduino etc.
Posted Date:2017-01-17 05:09:25.0
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. The BNC port can be used for current control from DC - 5 kHz. DC indicates that the current-level can also be controlled without modulation. I will contact you directly for further assistance.
Posted Date:2014-06-24 17:28:21.56
Can this T-cube driver be used to supply the single LED with forward voltage of 3 V? In the Spec the LED Forward Voltage of 12 V is mentioned.
Posted Date:2014-06-27 07:18:34.0
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. The LEDD1B is a current source which delivers a max output current of 1200mA. You can operate any LED with a forward voltage smaller than 11V with this controller so your LED with 3V will work fine. But you have to take care to set the current limit properly to avoid damaging your LED. Use of LEDs with a forward current lower than 200mA could also result in damage to the LED.
Posted Date:2014-03-26 10:33:52.203
For our application, stability of the light source is of the highest importance. Please can you tell me if intensity stability of the LEDs is primarily dictated by the LED itself (we're looking to use the 530 nm LED) or the LED driver. How do the four available LED drivers compare in terms of stability? We were assuming the parameter "current accuracy" will determine stability, is this assumption correct? Thanks, Stephen.
Posted Date:2014-03-28 08:16:27.0
This is a response from Thomas at Thorlabs. Thank you very much for your inquiry. We can provide different kinds of drivers. The LEDD1B is a switching driver and shows ripple in the output current which can be as high as 20%. The DC4100 is a linear driver and the main advantages of such a driver is low output current ripple and its EMC compatibility. These drivers are applicable for fluorescence microscopy. The DC2100 is a combination of linear and switching drivers, this method combines the advantage of both principles. A detailed description can be found in the manual of the LEDD1B at section 5.1 LED Driver. The parameter current accuracy does not indicate how stable the drivers are. I will contact you directly with more detailed information.
Posted Date:2010-04-01 11:17:49.0
a response from Julien at thorlabs: We checked and could indeed measure that pulses down to at least 5µs could be obtained with the DC2100 at a rep. rate of 10kHz and for a LED current of 1400mA.
Posted Date:2010-03-19 13:13:46.0
A response from Julien at Thorlabs to Adamt: when operated in pulsed mode, the LEDD1 has a minimum pulse width of 50µs. We are currently checking if the DC2100 can be brought to achieve 5µs pulses. We will get the test results within one or two weeks. I will contact you directly to discuss the specific details and requirements of your application.
Posted Date:2010-03-18 21:36:29.0
The ON/OFF time is listed as <25 microseconds. Do you have an idea of the shortest pulse widths possible? I am looking for an about 5 microsecond LED "flash"
Posted Date:2009-07-20 10:14:38.0
Pinout description is now in Overview and selection guide was added to other LED drivers.
Posted Date:2009-07-17 17:47:06.0
I had to search for the pin out diagram for the driver, this is pretty basic information that would best be given on the Overview tab. Also it is hard to understand all the different LED drivers offered by Thorlabs, can you add a selection guide and some links to thread them all together.

T-Cube LED Driver with Trigger Mode, 1200 mA (Power Supply Not Included)

The compact LEDD1B T-Cube is capable of driving LEDs with currents up to 1200 mA. The output power can be varied using the manual control knob and modulated using an external trigger signal; the maximum output current is set using an adjuster on the front of the T-Cube. A CAB-LEDD1 LED connection cable is included with each LEDD1B.

Power supplies are sold separately; please see the options below.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LEDD1B Support Documentation
LEDD1BT-Cube LED Driver, 1200 mA Max Drive Current (Power Supply Not Included)

Compatible Power Supplies

photo of power supply adapters
Click for Details

A location-specific adapter is shipped with the power supply unit based on your location. The adapters for the KPS101 are shown here.
photo of power supply options
Click to Enlarge

The KPS101 Power Supply Unit
  • Power Supplies
    • KPS101: For One K-Cube or T-Cube
  • USB Controller Hubs Provide Power and Communications
    • KCH301: For up to Three K-Cubes or T-Cubes
    • KCH601: For up to Six K-Cubes or T-Cubes
    • KAP101: Adapter Plate for Connecting 60 mm Wide T-Cubes to KCH Hubs
    • KAP102: Adapter Plate for Connecting 120 mm Wide T-Cubes to KCH Hubs

The KPS101 can supply up to 2.4 A and power a single K-Cube or T-Cube. It plugs into a standard wall outlet and provides +15 VDC.

The KCH301 and KCH601 USB Controller Hubs each consist of two parts: the hub, which can support up to three (KCH301) or six (KCH601) K-Cubes or T-Cubes, and a power supply that plugs into a standard wall outlet. The hub draws a maximum current of 10 A; please verify that the cubes being used do not require a total current of more than 10 A. In addition, the hub provides USB connectivity to any docked K-Cube or T-Cube through a single USB connection.

A KAP101 or KAP102 Adapter Plate (sold separately) is required for each T-Cube to operate on the KCH301 or KCH601 controller hub. The KAP101 is designed to adapt 60 mm wide T-Cubes to the hubs, while the KAP102 is designed to adapt 120 mm wide T-Cubes to the hubs.

For more information on the USB Controller Hubs, see the full web presentation.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
KPS101 Support Documentation
KPS10115 V, 2.4 A Power Supply Unit for One K-Cube or T-Cube
KCH301 Support Documentation
KCH301USB Controller Hub and Power Supply for Three K-Cubes or T-Cubes
KCH601 Support Documentation
KCH601USB Controller Hub and Power Supply for Six K-Cubes or T-Cubes
KAP101 Support Documentation
KAP101Adapter Plate for KCH Series Hubs and 60 mm Wide T-Cubes
KAP102 Support Documentation
KAP102Adapter Plate for KCH Series Hubs and 120 mm Wide T-Cubes

LED Connection Cable

 Pin Code
Male M8x1 Connector
PinDescriptionWire Color
1 LED Anode Brown
2 LED Cathode White
  • 4-Pin M8 Connector on One Side
  • 4 Bare Wires on Other Side
  • 2 m Long, 24 AWG Wires

The 4-Pin M8 connection cable can be used to connect the high-power LEDs on metal core PCB or other custom LEDs to the following Thorlabs LED drivers: LEDD1BDC2200DC4100, and DC4104 (the latter two require the DC4100-HUB).

Pin Connection - Male
The diagram above shows the male connector for use with the above Thorlabs LED drivers. The connector is a standard M8x1 sensor circular connector. Pins 1 and 2 are the connection to the LED. Please note that the pin connection diagram shown here may not be valid for third-party LED drivers.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
CAB-LEDD1 Support Documentation
CAB-LEDD1LED Connection Cable, 2 m, M8 Connector, 4 Wires
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