LED Ring Light Source


  • 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
  • Measured at 25 °C
  • When Driven with the Maximum Current
  • Measured Along the Emission Axis
  • Due to variations in the manufacturing process and operating parameters such as temperature and current, the actual spectral output of any given LED will vary. Correlated color temperature specs are only intended to be used as a guideline.
  • Non-Condensing
  • According to the Standard IEC 62471:2006, Photobiological Safety of Lamps and Lamp Systems
LEDRW40 attached to a Zoom Lens
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
Click to Enlarge
View Imperial Product List
Item #QtyDescription
LEDRW4015500 K, 370 mW (Min) LED Ring Light, 400 mA
SM2TC1Clamp for SM2 Lens Tubes
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
CP36130 mm Cage Plate, Ø1.2" Double Bore for SM1 and C-Mount Lens Tubes
SM1L201SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
TR21Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 2"
SH8S02518-32 Stainless Steel Cap Screw, 1/4" Long, 50 Pack
UPH21Ø1/2" Universal Post Holder, Spring Loaded Locking Thumbscrew, L = 2"
LEDD1B1T-Cube LED Driver, 1200 mA Max Drive Current (Power Supply Not Included)
KPS201115 V, 2.66 A Power Supply Unit with 3.5 mm Jack Connector for One K- or T-Cube
View Metric Product List
Item #QtyDescription
LEDRW4015500 K, 370 mW (Min) LED Ring Light, 400 mA
SM2TC1Clamp for SM2 Lens Tubes
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
CP36130 mm Cage Plate, Ø1.2" Double Bore for SM1 and C-Mount Lens Tubes
SM1L201SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
TR50/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm
SH4MS061M4 x 0.7 Stainless Steel Cap Screw, 6 mm Long, 50 Pack
UPH21Ø1/2" Universal Post Holder, Spring Loaded Locking Thumbscrew, L = 2"
LEDD1B1T-Cube LED Driver, 1200 mA Max Drive Current (Power Supply Not Included)
KPS201115 V, 2.66 A Power Supply Unit with 3.5 mm Jack Connector for One K- or T-Cube
The LEDRW40 Ring Light can be integrated into a 30 mm cage system as seen above.
LEDRW40 in a 30 mm Cage System
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 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 three drivers compatible with this LED ring light: LEDD1B, UPLED, and DC2200. See the LED Drivers tab for compatibility information and a list of specifications. The UPLED 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. 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
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 UPLEDa DC2200a
Click Photos to Enlarge LEDD1B Driver upLED Driver DC2200 Driver
LED Driver Current Output (Max)b 1.2 A 1.2 A LED1 Terminal: 10.0 A
LED2 Terminal: 2.0 Ac
LED Driver Forward Voltage (Max)d 12 V 8 V 50 V
Modulation Frequency Using External Input (Max) 5 kHz - 250 kHze,f
External Control Interface(s) 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)
USB-Controlled Touchscreen Interface with Internal and External Options for Pulsed and Modulated LED Operation
EEPROM Compatible: Reads Out LED Data for LED Settings - Yes Yes
LCD Display - - Yes
  • Automatically Adjusts the Driver's Current Limit via EEPROM Readout from LED
  • LEDs with maximum current ratings higher than the driver's maximum current output can be driven, but will not reach full power.
  • The LED sold below is compatible with the LED2 Terminal.
  • LEDs with forward voltage greater than the driver's maximum forward voltage cannot be driven. All drivers in this table are capable of driving the LEDRW40.
  • Small Signal Bandwidth: Modulation not exceeding 20% of full scale current. The driver accepts other waveforms, but the maximum frequency will be reduced.
  • The LEDRW40 must not be modulated at or above 9 kHz.

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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
Click Photo to Enlarge
(Representative; Not to Scale)
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
Click Photo to Enlarge
(Representative; Not to Scale)
Type PCB-
Mounted LEDs
Heatsink-
Mounted LEDs
Collimated LEDs for Microscopyb Fiber-
Coupled LEDs
c
High-Power LEDs for Microscopy Multi-Wavelength
LED Source Optionsd
  • Measured at 25 °C
  • These Collimated LEDs are compatible with the standard and epi-illumination ports on the following microscopes: Olympus BX/IX (Item # Suffix: -C1), Leica DMI (Item # Suffix: -C2), Zeiss Axioskop (Item # Suffix: -C4), and Nikon Eclipse (Bayonet Mount, Item # Suffix: -C5).
  • Typical power when used with MM Fiber with Ø400 µm core, 0.39 NA.
  • Our Multi-Wavelength LED Sources are available with select combinations of the LEDs at these wavelengths.
  • Typical power for LEDs with the Leica DMI collimation package (Item # Suffix: -C2).
  • Minimum power for the collimated output of these LEDs. The collimation lens is installed with each LED.
  • Typical power for LEDs with the Olympus BX and IX collimation package (Item # Suffix: -C1).
  • Typical power for LEDs with the Zeiss Axioskop collimation package (Item # Suffix: -C4).
  • Percentage of LED intensity that emits in the blue portion of the spectrum, from 400 nm to 525 nm.

LED Ring Light Source

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LEDRW40 Support Documentation
LEDRW405500 K, 370 mW (Min) LED Ring Light, 400 mA
$552.23
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