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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.
Compact Light Source & Driver Modules
Laser Sources
Laser Diode Driver
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.
Specification Value
Common Data
Output Current Range 0 - 1200 mA
LED Current Limit Set Point Range 200 - 1200 mA
LED Forward Voltage 11 V (Min)
12 V (Typical)
Current Ripple 8 mA
Current Ripple Frequency 570 kHz
Modulation Modea,b
Frequency Range 0 - 5 kHz, Sine Wave
Modulation Form Arbitrary
Input Voltage Rate 0 - 5 V
Slew Rate 13.6 mA/µs
Decay Rate 13.1 mA/µs
Trigger Modea
Frequency Range 0 - 1 kHz
Duty Cycle Range 20 - 80% @ 1 kHz
2 - 98% @ 100 Hz
0.2 - 99.8% @ 10 Hz
Modulation Form Square Wave / PWM
Logic Input Levels TTL
Min H-Level: 2 V
Max L-Level: 0.55 V
Slew Rate 18 mA/µs
Rise Time 51 µs
Decay Rate 12 mA/µs
Fall Time 79 µs
General Data
Power Supply 15 VDC
Maximum Power Consumption 15 VA
Operating Temperature 0 - 40 °C
Storage Temperature -40 to 70 °C
Weight 240 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.
  • Specifications are valid for a current limit of 1.2 A.

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.

Posted Comments:
Arthur Ludwigsen  (posted 2020-02-21 18:35:08.223)
What is the maximum length of cable that can be used between the M780L3 Mounted LED driven by a LEDD1B Driver?
MKiess  (posted 2020-02-26 09:31:51.0)
This is a response from Michael at Thorlabs. Thank you very much for your inquiry. We have not made special tests on the maximum length for all possible materials. In general, this depends on what kind of extension cable is used and what kind of connectors are used. If the internal resistance of the extension becomes too high, additional voltage drops across the extension, which is no longer available to the LED. When the system voltage is exhausted, the LED can no longer be operated at full current. I have contacted you directly to discuss the exact specifications.
Yuri Mal  (posted 2019-05-28 13:19:29.67)
It is said in specs that for LEDD1B it is required 0 - 5v to modulate LED intensity. My questions are: 1. What current is required to effectively (i.e. to achieve 100% modulation depth) module light intensity? 2. Related to above: what effective load the modulation input would represent for external source? Thank you in advance for your comments. Yuri
MKiess  (posted 2019-06-04 06:32:59.0)
This is a response from Michael at Thorlabs. Thank you very much for your inquiry. The specifications given for the modulation mode depends on the forward voltage and capacitance of the connected LED. Therefore the general procedure to determine the modulation depth is to connect a external voltage source to the MOD IN connector while the output voltage is set to 0V. If the external voltage is increased from 0V to 5V, the brightness of the LED should also increase accordingly. If the external voltage signal is now modulated, the LED is also modulated accordingly. Regarding the second question, the modulation input impedance is 10kΩ. I will contact you directly to provide further assistance.
jacob.artz  (posted 2019-02-07 11:34:34.853)
If we use the LEDD1B to drive a 1.5 A LED, will the LED be damaged? Or merely underpowered by 300 mA? Thank you.
swick  (posted 2019-02-18 03:25:48.0)
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. The 1.5 A LED would be under powered by the LEDD1B. We recommend using the DC2200 for LEDs with high current requirements.
user  (posted 2018-10-27 17:14:03.36)
Instead of using a bladed chopper, can this driver be used with a square-wave generator 0-5V at the MOD input? Would this enable differential intensity measurements?
swick  (posted 2018-11-21 03:22:56.0)
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. It is possible to apply rectangular pulses at MOD input. The resulting shape of the current signal is related to slew- and decay rate of the driver. Differential intensity measurements might be challenging as the LEDD1B can not be accurately set to specific current levels.
tmdavies1  (posted 2018-04-13 14:58:19.323)
Could this device be powered from a 14.4V 1.8Ah battery?
wskopalik  (posted 2018-04-19 04:21:53.0)
This is a response from Wolfgang at Thorlabs. Thank you very much for your inquiry. Generally the LEDD1B can be powered by a battery as well and a voltage of 14.4V would be sufficient. But the specifications of the LEDD1B could change slightly in this case, especially regarding the supported LED forward voltage. Unless your LED needs the full forward voltage range, this would however not be a problem. The forward voltage of most LEDs is much smaller than 11-12V. The battery would need to be able to provide the necessary current, i.e. it should be rated for more than 1A continuous current. In addition the voltage would need to be stable under load. I will contact you directly to provide further assistance.
utzinger  (posted 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?
swick  (posted 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.
massimo.baroncini  (posted 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.
wskopalik  (posted 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.
joshuamattjackson  (posted 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
wskopalik  (posted 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.
lester  (posted 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
wskopalik  (posted 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.
aroy  (posted 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.
swick  (posted 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.
user  (posted 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.
shallwig  (posted 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.
sc13967  (posted 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.
tschalk  (posted 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.
julien  (posted 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.
julien  (posted 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.
adamt  (posted 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"
klee  (posted 2009-07-20 10:14:38.0)
Pinout description is now in Overview and selection guide was added to other LED drivers.
acable  (posted 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.

Please note that unlike our other T- and K-Cube modules, the LEDD1B LED Driver is fully manual. This T-Cube lacks USB connectivity and cannot be controlled via APT or Kinesis® software.

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
LEDD1B Support Documentation
LEDD1BT-Cube LED Driver, 1200 mA Max Drive Current (Power Supply Not Included)
Lead Time

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 K-Cubes™ or T-Cubes™ with 3.5 mm Jacks
  • 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. Please note that the LEDD1B LED Driver does not include USB connectivity and cannot be controlled through APT or Kinesis® software.

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
KPS101 Support Documentation
KPS10115 V, 2.4 A Power Supply Unit with 3.5 mm Jack Connector for One K- 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
5-8 Days
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
CAB-LEDD1 Support Documentation
CAB-LEDD1LED Connection Cable, 2 m, M8 Connector, 4 Wires
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