LED Ring Light Source
![](https://www.thorlabs.de/Images/GuideImages/15826_LED_Ring_Light_1.jpg)
- LED Ring Light with Ø0.99" Clear Aperture
- Array of 40 High Brightness LEDs
- Compatible with Thorlabs' LED Drivers
LEDRW40
Ø0.99" Clear Aperture
LED Ring Light
Application Idea
The LEDRW40 Ring Light can be post-mounted using an SM2TC Clamp.
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Item # | LEDRW40 | |
---|---|---|
Min | Typical | |
LED Power Outputa,b | 370 mW | 540 mW |
Forward Voltagea,b | - | 6.4 V |
Maximum Irradiance at 75 mma,b,c | - | 310 µW/mm2 |
Maximum Irradiance at 200 mma,b,c | - | 88 µW/mm2 |
General Specifications | ||
Color | Daylight White | |
Correlated Color Temperatured | 5500 K | |
Optimal Working Distance | 50 - 300 mm | |
Maximum Current (CW)a | 400 mA | |
Electrical Powera | 2560 mW | |
Typical Lifetimea | >10 000 h | |
Operating Temperaturee | 0 to 40 °C | |
Storage Temperature | -40 to 70 °C | |
Risk Groupf | RG2 - Moderate Risk Group | |
Output Spectrumd (Click to View) |
![]() Click Here for Raw Data |
![LEDRW40 attached to a Zoom Lens](https://www.thorlabs.de/images/tabImages/LEDRW40_ZoomLens_A1-400.jpg)
Click to Enlarge
The LEDRW40 Ring Light has three nylon-tipped setscrews to interface with zoom lenses such as the MVL6X12Z.
![LEDRW40 in a 30 mm Cage System](https://www.thorlabs.de/images/tabImages/LEDRW40_CageSystem_A1-200.jpg)
Click to Enlarge
The LEDRW40 Ring Light can be integrated into a 30 mm cage system as seen above.
![LEDRW40 in a 30 mm Cage System](https://www.thorlabs.de/images/tabImages/LEDRW40_Top-200.jpg)
Click to Enlarge
Illuminated areas can be viewed through the LEDRW40 Ring Light, which has a clear aperture of Ø0.99".
Features
- LED Ring Array Composed of 40 High Brightness LEDs
- Ø0.99" (Ø25.1 mm) Clear Aperture
- 50 - 300 mm Optimal Working Distance
- Compatible with Our 30 mm Cage System
- >10 000 Hour Typical Lifetime
- Integrated Memory (EEPROM) Stores LED Operating Parameters
- Integrated M8 Connector for use with Thorlabs' LED Drivers
Thorlabs' LED Ring Light Source consists of 40 individual broadband, daylight white LEDs in a ring-shaped array with a Ø0.99" (Ø25.1 mm) clear aperture. By angling the LEDs, this ring light illuminates areas from 50 mm to 300 mm along the emission axis that can then be viewed through the clear aperture, making it ideal for machine vision applications.
Constructed from anodized aluminum, this LED ring light housing features four 4-40 tapped holes that are compatible with our Ø6 mm ER cage rods, allowing for integration with 30 mm cage systems. The housing also features three setscrews on the sides for interfacing with various camera lenses and high-magnification zoom lens systems (as seen in the photo in the bottom right), which can be secured using a 5/64" (2.0 mm) hex key or balldriver. An M60 x 1.0 external thread at the head of the ring light gives the option of attaching various elements such as custom filters or diffusers.
For convenient connection to the drivers listed below and on the LED Drivers tab, the LED ring light has a connection cable with an M8 connector; see the Pin Diagram tab for the M8 connector pin information. This LED ring light also features an EEPROM chip which stores information about the LED (e.g., current limit, forward voltage). When controlled by a Thorlabs UPLED, DC40, or DC2200 LED driver, this data can be used to implement smart safety features.
White Light LEDs
This illuminator is a daylight white LED ring featuring a broad spectrum that spans several hundred nanometers; see the table to the right for a typical output spectrum. It has a correlated color temperature 5500 K, which indicates that the color appearance is similar to a black body radiator at the same temperature. In general, warm white LEDs offer a spectrum similar to a tungsten source, while cold white LEDs have a stronger blue component to the spectrum; daylight white LEDs provide a more even illumination spectrum over the visible range than warm white or cold white LEDs. To discuss LED ring lights with other correlated color temperatures or nominal wavelengths, please contact Tech Support.
Driver Options
Thorlabs offers four drivers compatible with this LED ring light: LEDD1B, DC40, UPLED, and DC2200. See the LED Drivers tab for compatibility information and a list of specifications. The UPLED, DC40, and DC2200 drivers are capable of reading the current limit from the EEPROM chip of the connected LED ring light and automatically adjusting the maximum current setting to protect the LEDs. The DC40 LED driver can provide drive currents with up to a 5 kHz modulation when supplied with an external modulation signal. While the DC2200 driver is capable of modulating frequencies up to 250 kHz, the LED ring light must not be modulated at or above 9 kHz.
Please note that this LED ring light is not intended for use in household illumination applications.
Thorlabs also offers a range of unmounted, mounted, collimated, and fiber-coupled LEDs that are designed for a variety of applications, including microscopy, illumination, and measurements. For questions on choosing an appropriate LED and to discuss mounting requirements, please contact Tech Support.
Note that the color of the M8 connector for this device may vary.
![Pin Out](https://www.thorlabs.de/images/TabImages/LED_Connector_Male_D1-72.jpg)
Pin | Specification | Wire Color |
---|---|---|
1 | LED Anode | Brown |
2 | LED Cathode | White |
3 | EEPROM GND | Black |
4 | EEPROM IO | Blue |
Pin Connection - Male
The diagram to the right shows the male connector of the LEDRW40 Ring Light. It is a standard M8 x 1 sensor circular connector. Pins 1 and 2 are the connection to the LED. Pin 3 and 4 are used for the internal EEPROM. If using an LED driver that was not purchased from Thorlabs, be careful that the appropriate connections are made to Pin 1 and Pin 2 and that you do not attempt to drive the LED through the EEPROM pins.
To fully support the max optical power of the LED you intend to drive, ensure that the max voltage and max current of the driver are equal to or greater than those of the LED.
Compatible Drivers | LEDD1B | DC40a | UPLEDa | DC2200a |
---|---|---|---|---|
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LED Driver Current Output (Max)b | 1.2 A | 4.0 Ac | 1.2 A | LED1 Terminal: 10.0 A LED2 Terminal: 2.0 Ad |
LED Driver Forward Voltage (Max)e | 12 V | 14.0 Vc | 8 V | 50 V |
Modulation Frequency Using External Input (Max) | 5 kHz | 5 kHz | - | 250 kHzf,g |
External Control Interface(s) | Analog (BNC) | USB 2.0, TTL, and Analog (BNC) | USB 2.0 | USB 2.0 and Analog (BNC) |
Main Driver Features | Very Compact Footprint 60 mm x 73 mm x 104 mm (W x H x D) |
Driver Current Up to 4.0 A, Manual and USB-Controlled |
USB-Controlled | Touchscreen Interface with Internal and External Options for Pulsed and Modulated LED Operation |
EEPROM Compatible: Reads Out LED Data for LED Settings | - | ![]() |
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LCD Display | - | - | - | ![]() |
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This tab includes all LEDs sold by Thorlabs. Click on More [+] to view all available wavelengths for each type of LED pictured below.
Light Emitting Diode (LED) Selection Guide | ||||||
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Click Photo to Enlarge (Representative; Not to Scale) |
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Type | Unmounted LEDs | Pigtailed LEDs | LEDs in SMT Packages |
LED Arrays | LED Ring Light | Cage-Compatible Diffuse Backlight LED |
Light Emitting Diode (LED) Selection Guide | ||||||
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Click Photo to Enlarge (Representative; Not to Scale) |
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Type | PCB- Mounted LEDs |
Heatsink- Mounted LEDs |
Collimated LEDs for Microscopyb | Fiber- Coupled LEDsc |
High-Power LEDs for Microscopy | Multi-Wavelength LED Source Optionsd |