Precise optical path design, compact and reliable overall structure, the output light is close to ideal parallel light, can be used for high-precision size measurement, can also be used with coaxial light.

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.

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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.

TPLbacklight

Driver OptionsThorlabs 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.

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.

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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 Figure 1.4), 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.

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.

Precise optical path design, compact and reliable overall structure, the output light is close to ideal parallel light, can be used for high-precision size measurement, can also be used with coaxial light, backlight and other series of lights, used to inspect smooth plane small scratches, scratches and other defects.

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A 'light meter' is a handheld device that used measure or 'meter' light. A light meter can read the ambient light in a scene, or the direct light from a light ...

This tab includes all LEDs sold by Thorlabs. Click on More [+] to view all available wavelengths for each type of LED pictured below.

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Collimating film

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Machine visionbacklight

This light meter accurately displays light levels in terms of Lux (lx) and Foot Candles (fc). These are both measures of lighting intensity.

Figure 2.1 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.

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White Light LEDsThis illuminator is a daylight white LED ring featuring a broad spectrum that spans several hundred nanometers; see Table 1.1 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.