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Light Control Feature Set#

The Light Control feature set allows you to control up to 4 light devices via the pylon software.

The Light Control feature set is based on the SLP protocol that enables cameras and light devices to communicate directly with each other.

If you use a Basler Standard Light or any other machine vision LED standard lighting, you need the Basler SLP Strobe Controller to enable the communication between the camera and the light.

If you use a Basler Camera Light, a separate controller is not required as the controller features are already included.

Using the Feature#

Configuring the Basler Light / Light Controller#

  1. If you haven't done so yet, connect the controller and the light.
  2. Enable the Polling option in the pylon Viewer.
  3. Set the BslLightControlMode parameter to On.
    The BslLightControlSource parameter will show which GPIO line of the camera is used to control the light features.
    If you're connecting a new controller, it will automatically be assigned the next available light device ID.
  4. Execute the BslLightControlEnumerateDevices command.
  5. If you have several Basler lights or light controllers in your environment, set the BslLightDeviceSelector parameter to the device that you want to configure.
    Make sure that there are no light device ID conflicts.
  6. If you use a Basler SLP Strobe Controller, specify whether you want to control the light device using current or voltage via the BslLightDeviceControlMode parameter. Every light can be controlled via current control. For lights designed for a 12 VDC or 24 VDC connection, it is recommended to use voltage control. If you use a Basler Camera Light, you can skip this step. The parameter is set automatically in this case.


    Note that every time you're switching from current to voltage or vice versa, there is a short initialization phase of the controller during which the connected light lights up. This can last for up to 15 s and is normal behavior.

  7. If you use a Basler SLP Strobe Controller, set the BslLightDeviceMaxCurrent parameter to the maximum current rating of your light in continuous operation.
    If you use a Basler Camera Light, the maximum current is set automatically.
    This ensures that your light will not get damaged and that you can safely use the whole current range of your light using the BslLightDeviceBrightness parameter.
    You can only change the BslLightDeviceMaxCurrent parameter value, when the BslLightDeviceOperationMode parameter is set to Off.

  8. Set the BslLightDeviceBrightness parameter to the desired brightness.
    This parameter can be set in a range from 0 to 100 %. 100 % corresponds to the current that you have specified with the BslLightDeviceMaxCurrent parameter. 50 % will reduce the current by a factor of 2. The Basler Camera Light uses pulse width modulation (PWM), the Basler SLP Strobe Controller doesn't. PWM can lead to brightness fluctuations for short exposure times (< 500 µs) or to stripes in rolling shutter cameras.
  9. Set the BslLightDeviceOperationMode parameter to the desired mode:
    • On: This will make the light shine continuously.
    • Strobe: This will set the light to strobe mode. You can configure the strobe mode with the BslLightDeviceStrobeMode and BslLightDeviceStrobeDuration parameters.

Configuring the Strobe Mode#

One of the advantages of the strobe mode is that it can help to increase the life expectancy of your light. By not operating it continuously but like a flash when needed, less heat is generated in the LEDs. This slows down the aging process of the lights. The other advantage is that while in strobe mode you can overdrive the lights, i.e., increase the current supplied to a maximum of 500 % (for the light controller), which increases the brightness of your light. Before you do so, read the instructions in the Overdrive Mode section.

On rolling shutter cameras, if you have set the BslLightDeviceOperationMode parameter to Strobe, use the BslLightControlTriggerMode parameter to determine how to trigger the light. Different trigger modes are available:

  • ExposureActive: Use this mode only if you're not overlapping image acquisitions.
  • FlashWindow: If you use this mode, make sure that the camera generates a Flash Window signal.

On global shutter cameras, the trigger mode is preset.


There is a delay of approx. 23 µs between exposure start and the light being turned on.


The implementation of the Flash Window signal in connection with the Light Control feature set is still under development. Especially with very short Flash Window signals, the results may not be satisfactory (some lines in the resulting images may be too bright while others are too dark).

To control the duration of the individual strobe pulses, you have to specify whether you want automatic or manual strobe operation using the BslLightDeviceStrobeMode parameter.

  • Automatic: The duration of the individual strobe pulses is controlled by the ExposureTime parameter of the camera. The strobe lasts for the duration of the exposure time that you have specified. For more information, see the Troubleshooting section.
  • Manual: You can define the duration of the individual strobe pulses yourself using the BslLightDeviceStrobeDuration parameter. If you're operating the camera at the upper end of its capabilities, overtriggering may occur.


If you're using the Trigger Width exposure mode, the Sequencer feature, or any of the camera's auto functions (e.g., Auto Exposure, Auto Gain) you have to use the Manual strobe mode.


The camera uses the same line for triggering the light and transmitting any changes of light control parameter settings. As parameter changes take precedence, during this time the line will not be available for the trigger signal and strobe operation will be disrupted. To avoid this, check the BslLightControlStatus. If the value is Ready, it means that the light device is ready to receive a trigger. Alternatively, only change parameter settings while the strobe mode is disabled.

Overdrive Mode#

Overdriving your light means that you can increase the current, resulting in a higher light intensity, while the light is in strobe mode.

NOTICE – Incorrect operation may damage your lights.

Carefully read the instructions in this section to avoid damaging the connected lights and to ensure that the lights don't age prematurely.

When using the overdrive mode, you have to consider the following aspects to avoid damaging your light:

  • In strobe mode, the BslLightDeviceBrightness parameter can be set to values above 100 %. The maximum value depends on the strobe pulse duration and the duty cycle. For Basler Camera Lights, the maximum allowed brightness is calculated automatically and the range of the brightness slider will be adjusted accordingly. When using a third-party light and the Basler SLP Strobe Controller, you have to calculate the maximum brightness value yourself and enter this value in the BslLightDeviceOverdriveLimit parameter. For example, 200 % means that the maximum current in strobe operation will be twice as high as the BslLightDeviceMaxCurrent parameter value.
  • Check with the manufacturer of your light if you're not sure what the maximum current is that your light can withstand in strobe mode. The Basler SLP Strobe Controller allows setting the BslLightDeviceOverdriveLimit parameter to 500 % but most lights are not able to withstand the currents that would result from this overdrive limit.
  • As the increased current flow will cause the LEDs to heat up more, you have to allow sufficient time between individual strobe pulses for the light to cool down again. As a general rule of thumb, the higher the intensity of the pulse, the more time you should leave between pulses.
  • Consider the exposure time as this affects the length and the duty cycle of the pulses.


Safety features that avoid damaging the controller hardware.

  • Currents above 2 A in combination with long exposure times and high duty cycles may damage the controller hardware. In order to avoid this, the maximum allowed current is calculated automatically and the maximum allowed brightness is reduced accordingly (see Table 1).
    The duty cycle calculation is based on the maximum possible frame rate of the camera. The maximum possible frame rate of the camera can be reduced by using the Acquisition Frame Rate feature.

Safety features that avoid damaging the light.

  • If the chosen overdrive brightness is too high in respect to the strobe duration and the duty cycle (see Table 2), the strobe duration will be reduced or triggers will be ignored.
Table 1 (Controller Protection)#
Output Current
(BslLightDeviceBrightness x
Max. Strobe Duration Max. Duty Cycle
Under 2 A - 100 %
2 A to <3 A 5 ms 15 %
3 A to <4 A 5 ms 8 %
4 A to <5 A 5 ms 6 %
5 A to <6 A 5 ms 4 %
6 A to <8 A 1 ms 4 %
8 A to <9 A 1 ms 3 %
9 A to <10 A 1 ms 2 %
Table 2 (Light Protection)#
Required Brightness Max. Strobe Duration Max. Duty Cycle
0–100 % - 100 %
101–200 % 30 ms 30 %
201–300 % 10 ms 20 %
301–500 % 2 ms 10 %
501–1000 % 1 ms 5 %

Changing the Light Device ID#

To change the ID of a light:

  1. Set the BslLightControlMode parameter to On.
  2. Set the BslLightDeviceOperationMode parameter to Off.
  3. Set the BslLightDeviceSelector parameter to the Basler light / controller whose ID you want to change.
  4. Set the BslLightDeviceChangeID parameter to the desired value.
    The ID will be changed immediately.


Using More Than One Light Device or Basler Camera Light

When using more than one light device, you have to make sure that their IDs are all different. Using devices with identical IDs will cause communication errors. Duplicate IDs can occur, if you're connecting new devices for the first time because all devices are shipped with the light device ID set to 7. It can also occur when connecting existing devices from another system as light device IDs are remembered by the device once they have been set. The best way to prevent conflicts, is to connect devices one after the other and always assign a new and unique ID after having connected a device.


Checking and Clearing Errors#

The light / light controller can detect errors that you can correct yourself. Check the BslLightDeviceLastError parameter to find out which error has occurred. After you have corrected the error, you can clear it from the list.

Up to 25 errors can be stored. If a 26th error occurs, the oldest error will be overwritten and so on.

If you have several lights / light controllers connected, the BslLightControlErrorStatus tells you which device is experiencing problems.

Checking and clearing errors is an iterative process, depending on how many errors have occurred.

To check and clear errors:

  1. To check the last error that has occurred, get the value of the BslLightDeviceLastError parameter.
  2. Correct the corresponding error.
  3. To delete the last error from the list of errors, execute the BslLightDeviceClearLastError command.
  4. Continue getting and deleting the last error until the BslLightDeviceLastError parameter shows NoError.

Available Error Codes

Value Meaning
No Error The light / light controller hasn't detected any errors since the last time the error memory was cleared.
Communication Error A communication error occurs if the data transmission between the light / light controller and the camera is faulty. This can be caused by using cables that are too long or by too much noise on the line.
Connection Error A connection error occurs if the connection between the light / light controller and the camera is broken or if a communication error has already occurred. Other reasons may be loose connections or the controller being disconnected completely.
Hardware Error The light / light controller is experiencing a technical fault. Disconnecting and reconnecting the power supply may solve the issue. See Power-Cycling the Controller for more information.

Overtriggering in Automatic Strobe Mode#

If you're operating the camera at the upper end of its capabilities, overtriggering of the light / light controller may occur. Overtriggering means that the light / light controller receives a trigger while it isn't ready for it, e.g., because it is still in the process of switching off the light. This would mean that the trigger is ignored and the light would not come on for the next exposure. To better understand this problem, consider the following example.

A camera that is capable of 100 fps is operated with the exposure time set to 50 ms, i.e., the camera would acquire 20 frames per second in quick succession without any pause between the exposures. This means that the trigger for the light / light controller would have to come exactly at the edge between two exposures. In practice, this is almost impossible because of an inherent jitter that causes the trigger to sometimes arrive while the light is still switching off. In those cases, the trigger will be ignored and the resulting image will be too dark.

Because the jitter is irregular, there is no precise method to prevent this happening. If you notice that some of your images are darker than the others, consider if operating the light in continuous mode is an option. You could also try adjusting the frame rate, e.g., using 19 fps instead of 20 fps.

Power-Cycling the Controller#

To ensure power-cycling, the controller needs to be disconnected from electricity for five minutes. This is normal behavior. If you're using more than one controller, the other controllers need to be power-cycled as well even if they haven't experienced any faults.

First Image too Dark#

When setting the BslLightControlMode parameter to On, there is a delay of up to 1 second until the light device is actually turned on. Because of this, the first image may be too dark. Either discard this image, or, if you need all images, only start image acquisition after a suitable delay, e.g., by using a timer.


Show all camera models

Camera Model Available Light Control Trigger Modes
a2A1920-51gcBAS Feature not supported
a2A1920-51gcPRO Feature not supported
a2A1920-51gmBAS Feature not supported
a2A1920-51gmPRO Feature not supported
a2A1920-160ucBAS Feature not supported
a2A1920-160ucPRO Feature not supported
a2A1920-160umBAS Feature not supported
a2A1920-160umPRO Feature not supported
a2A1920-165g5cBAS Feature not supported
a2A1920-165g5mBAS Feature not supported
a2A2448-23gcBAS Feature not supported
a2A2448-23gcPRO Feature not supported
a2A2448-23gmBAS Feature not supported
a2A2448-23gmPRO Feature not supported
a2A2448-75ucBAS Feature not supported
a2A2448-75ucPRO Feature not supported
a2A2448-75umBAS Feature not supported
a2A2448-75umPRO Feature not supported
a2A2448-105g5cBAS Feature not supported
a2A2448-105g5mBAS Feature not supported
a2A2590-22gcBAS Feature not supported
a2A2590-22gcPRO Feature not supported
a2A2590-22gmBAS Feature not supported
a2A2590-22gmPRO Feature not supported
a2A2590-60ucBAS Feature not supported
a2A2590-60ucPRO Feature not supported
a2A2590-60umBAS Feature not supported
a2A2590-60umPRO Feature not supported
a2A2600-20gcBAS Feature not supported
a2A2600-20gcPRO Feature not supported
a2A2600-20gmBAS Feature not supported
a2A2600-20gmPRO Feature not supported
a2A2600-64ucBAS Feature not supported
a2A2600-64ucPRO Feature not supported
a2A2600-64umBAS Feature not supported
a2A2600-64umPRO Feature not supported
a2A2840-14gcBAS Feature not supported
a2A2840-14gcPRO Feature not supported
a2A2840-14gmBAS Feature not supported
a2A2840-14gmPRO Feature not supported
a2A2840-48ucBAS Feature not supported
a2A2840-48ucPRO Feature not supported
a2A2840-48umBAS Feature not supported
a2A2840-48umPRO Feature not supported
a2A2840-67g5cBAS Feature not supported
a2A2840-67g5mBAS Feature not supported
a2A3840-13gcBAS Feature not supported
a2A3840-13gcPRO Feature not supported
a2A3840-13gmBAS Feature not supported
a2A3840-13gmPRO Feature not supported
a2A3840-45ucBAS Feature not supported
a2A3840-45ucPRO Feature not supported
a2A3840-45umBAS Feature not supported
a2A3840-45umPRO Feature not supported
a2A4096-9gcBAS Feature not supported
a2A4096-9gcPRO Feature not supported
a2A4096-9gmBAS Feature not supported
a2A4096-9gmPRO Feature not supported
a2A4096-30ucBAS Feature not supported
a2A4096-30ucPRO Feature not supported
a2A4096-30umBAS Feature not supported
a2A4096-30umPRO Feature not supported
a2A4096-44g5cBAS Feature not supported
a2A4096-44g5mBAS Feature not supported
a2A4200-12gcBAS Feature not supported
a2A4200-12gcPRO Feature not supported
a2A4200-12gmBAS Feature not supported
a2A4200-12gmPRO Feature not supported
a2A4200-40ucBAS Feature not supported
a2A4200-40ucPRO Feature not supported
a2A4200-40umBAS Feature not supported
a2A4200-40umPRO Feature not supported
a2A4504-5gcBAS Feature not supported
a2A4504-5gcPRO Feature not supported
a2A4504-5gmBAS Feature not supported
a2A4504-5gmPRO Feature not supported
a2A4504-18ucBAS Feature not supported
a2A4504-18ucPRO Feature not supported
a2A4504-18umBAS Feature not supported
a2A4504-18umPRO Feature not supported
a2A4504-27g5cBAS Feature not supported
a2A4504-27g5mBAS Feature not supported
a2A5320-7gcBAS Feature not supported
a2A5320-7gcPRO Feature not supported
a2A5320-7gmBAS Feature not supported
a2A5320-7gmPRO Feature not supported
a2A5320-23ucBAS Feature not supported
a2A5320-23ucPRO Feature not supported
a2A5320-23umBAS Feature not supported
a2A5320-23umPRO Feature not supported
a2A5320-34g5cBAS Feature not supported
a2A5320-34g5mBAS Feature not supported
a2A5328-4gcBAS Feature not supported
a2A5328-4gcPRO Feature not supported
a2A5328-4gmBAS Feature not supported
a2A5328-4gmPRO Feature not supported
a2A5328-15ucBAS Feature not supported
a2A5328-15ucPRO Feature not supported
a2A5328-15umBAS Feature not supported
a2A5328-15umPRO Feature not supported
a2A5328-22g5cBAS Feature not supported
a2A5328-22g5mBAS Feature not supported
acA640-90gc Feature not supported
acA640-90uc Feature not supported
acA640-121gm Feature not supported
acA640-300gc Exposure Active
acA640-300gm Exposure Active
acA640-750uc Exposure Active
acA640-750um Exposure Active
acA720-290gc Exposure Active
acA720-290gm Exposure Active
acA720-520uc Exposure Active
acA720-520um Exposure Active
acA800-200gc Exposure Active
acA800-200gm Exposure Active
acA800-510uc Exposure Active
acA800-510um Exposure Active
acA1280-60gc Feature not supported
acA1280-60gm Feature not supported
acA1300-60gc Feature not supported
acA1300-60gm Feature not supported
acA1300-60gmNIR Feature not supported
acA1300-75gc Exposure Active
acA1300-75gm Exposure Active
acA1300-200uc Exposure Active
acA1300-200um Exposure Active
acA1440-73gc Exposure Active
acA1440-73gm Exposure Active
acA1440-220uc Exposure Active
acA1440-220um Exposure Active
acA1600-20gc Feature not supported
acA1600-20uc Feature not supported
acA1600-60gc Feature not supported
acA1600-60gm Feature not supported
acA1920-25gc Feature not supported
acA1920-25gm Feature not supported
acA1920-25uc Feature not supported
acA1920-25um Feature not supported
acA1920-40gc Exposure Active
acA1920-40gm Exposure Active
acA1920-40uc Exposure Active
acA1920-40ucMED Feature not supported
acA1920-40um Exposure Active
acA1920-40umMED Feature not supported
acA1920-48gc Exposure Active
acA1920-48gm Exposure Active
acA1920-50gc Exposure Active
acA1920-50gm Exposure Active
acA1920-150uc Exposure Active
acA1920-150um Exposure Active
acA1920-155uc Exposure Active
acA1920-155ucMED Feature not supported
acA1920-155um Exposure Active
acA1920-155umMED Feature not supported
acA2000-50gc Feature not supported
acA2000-50gm Feature not supported
acA2000-165uc Feature not supported
acA2000-165um Feature not supported
acA2040-25gc Feature not supported
acA2040-25gm Feature not supported
acA2040-25gmNIR Feature not supported
acA2040-35gc Exposure Active
acA2040-35gm Exposure Active
acA2040-55uc Exposure Active
acA2040-55um Exposure Active
acA2040-90uc Feature not supported
acA2040-90um Feature not supported
acA2040-90umNIR Feature not supported
acA2040-120uc Exposure Active
acA2040-120um Exposure Active
acA2440-20gc Exposure Active
acA2440-20gm Exposure Active
acA2440-35uc Exposure Active
acA2440-35ucMED Feature not supported
acA2440-35um Exposure Active
acA2440-35umMED Feature not supported
acA2440-75uc Exposure Active
acA2440-75ucMED Feature not supported
acA2440-75um Exposure Active
acA2440-75umMED Feature not supported
acA2500-14gc Feature not supported
acA2500-14gm Feature not supported
acA2500-14uc Feature not supported
acA2500-14um Feature not supported
acA2500-20gc Exposure Active
acA2500-20gcMED Feature not supported
acA2500-20gm Exposure Active
acA2500-20gmMED Feature not supported
acA2500-60uc Exposure Active
acA2500-60um Exposure Active
acA3088-16gc Exposure Active
Flash Window
acA3088-16gm Exposure Active
Flash Window
acA3088-57uc Exposure Active
Flash Window
acA3088-57ucMED Feature not supported
acA3088-57um Exposure Active
Flash Window
acA3088-57umMED Feature not supported
acA3800-10gc Feature not supported
acA3800-10gm Feature not supported
acA3800-14uc Feature not supported
acA3800-14um Feature not supported
acA4024-8gc Exposure Active
Flash Window
acA4024-8gm Exposure Active
Flash Window
acA4024-29uc Exposure Active
Flash Window
acA4024-29um Exposure Active
Flash Window
acA4096-11gc Exposure Active
acA4096-11gm Exposure Active
acA4096-30uc Exposure Active
acA4096-30ucMED Feature not supported
acA4096-30um Exposure Active
acA4096-30umMED Feature not supported
acA4096-40uc Exposure Active
acA4096-40ucMED Feature not supported
acA4096-40um Exposure Active
acA4096-40umMED Feature not supported
acA4112-8gc Exposure Active
acA4112-8gm Exposure Active
acA4112-20uc Exposure Active
acA4112-20ucMED Feature not supported
acA4112-20um Exposure Active
acA4112-20umMED Feature not supported
acA4112-30uc Exposure Active
acA4112-30ucMED Feature not supported
acA4112-30um Exposure Active
acA4112-30umMED Feature not supported
acA4600-7gc Feature not supported
acA4600-10uc Feature not supported
acA5472-5gc Exposure Active
Flash Window
acA5472-5gm Exposure Active
Flash Window
acA5472-17uc Exposure Active
Flash Window
acA5472-17ucMED Feature not supported
acA5472-17um Exposure Active
Flash Window
acA5472-17umMED Feature not supported
boA1936-400cc Feature not supported
boA1936-400cm Feature not supported
boA2448-250cc Feature not supported
boA2448-250cm Feature not supported
boA2832-190cc Feature not supported
boA2832-190cm Feature not supported
boA4096-93cc Feature not supported
boA4096-93cm Feature not supported
boA4096-180cc Feature not supported
boA4096-180cm Feature not supported
boA4112-68cc Feature not supported
boA4112-68cm Feature not supported
boA4500-45cc Feature not supported
boA4500-45cm Feature not supported
boA4504-100cc Feature not supported
boA4504-100cm Feature not supported
boA5320-150cc Feature not supported
boA5320-150cm Feature not supported
boA5328-100cc Feature not supported
boA5328-100cm Feature not supported
boA6500-36cc Feature not supported
boA6500-36cm Feature not supported
boA8100-16cc Feature not supported
boA8100-16cm Feature not supported
daA720-520uc Feature not supported
daA720-520um Feature not supported
daA1280-54uc Feature not supported
daA1280-54um Feature not supported
daA1440-220uc Feature not supported
daA1440-220um Feature not supported
daA1600-60uc Feature not supported
daA1600-60um Feature not supported
daA1920-15um Feature not supported
daA1920-30uc Feature not supported
daA1920-30um Feature not supported
daA1920-160uc Feature not supported
daA1920-160um Feature not supported
daA2448-70uc Feature not supported
daA2448-70um Feature not supported
daA2500-14uc Feature not supported
daA2500-14um Feature not supported
daA3840-45uc Feature not supported
daA3840-45um Feature not supported
puA1280-54uc Feature not supported
puA1280-54um Feature not supported
puA1600-60uc Feature not supported
puA1600-60um Feature not supported
puA1920-30uc Feature not supported
puA1920-30um Feature not supported
puA2500-14uc Feature not supported
puA2500-14um Feature not supported

Sample Code#

// Enable the light control mode
//Enumerate the light devices
//Select light device 1
//Set the maximum current of device 1 to 100 mA
//Set the brightness to 100 %
//Set the operation mode to continuous
INodeMap& nodemap = camera.GetNodeMap();
// Enable the light control mode
CEnumParameter(nodemap, "BslLightControlMode").SetValue("On");
// Enumerate the light devices
CCommandParameter(nodemap, "BslLightControlEnumerateDevices").Execute();
// Select light device 1
CEnumParameter(nodemap, "BslLightDeviceSelector").SetValue("Device1");
// Set the maximum current of device 1 to 100 mA
CFloatParameter(nodemap, "BslLightDeviceMaxCurrent").SetValue(100.0);
// Set the brightness to 100 %
CFloatParameter(nodemap, "BslLightDeviceBrightness").SetValue(100.0);
// Set the operation mode to continuous
CEnumParameter(nodemap, "BslLightDeviceOperationMode").SetValue("On");
// Enable the light control mode
// Enumerate the light devices
// Select light device 1
// Set the maximum current of device 1 to 100 mA
// Set the brightness to 100 %
// Set the operation mode to continuous
/* Macro to check for errors */
#define CHECK(errc) if (GENAPI_E_OK != errc) printErrorAndExit(errc)
GENAPIC_RESULT errRes = GENAPI_E_OK;  /* Return value of pylon methods */
/* Enable the light control mode */
errRes = PylonDeviceFeatureFromString(hdev, "BslLightControlMode", "On");
/* Enumerate the light devices */
errRes = PylonDeviceExecuteCommandFeature(hdev, "BslLightControlEnumerateDevices");
/* Select light device 1 */
errRes = PylonDeviceFeatureFromString(hdev, "BslLightDeviceSelector", "Device1");
/* Set the maximum current of device 1 to 100 mA */
errRes = PylonDeviceSetFloatFeature(hdev, "BslLightDeviceMaxCurrent", 100.0);
/* Set the brightness to 100 % */
errRes = PylonDeviceSetFloatFeature(hdev, "BslLightDeviceBrightness", 100.0);
/* Set the operation mode to continuous */
errRes = PylonDeviceFeatureFromString(hdev, "BslLightDeviceOperationMode", "On");

You can also use the pylon Viewer to easily set the parameters.