It’s also important to pair the lens focal length correctly in order to prevent vignetting, or “port-holing” – which is particularly true of the Diffuse Dome Light.

Using a ring light for the first time could be a little jarring. You now have this bright light aimed at your eyes while you’re on Zoom. When setting up your light, you want to make sure you’re not blown out (or too washed out).

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Additionally, LED lights are designed more for videography and product showcases. LED lights also tend to be a little more expensive than ring lights. The best thing about a ring light is that it has space for your camera to allow you to shoot through it. The shape of a ring light is designed to be used more for capturing faces. If you plan on having a ton of in-home meetings and interviews, or starting your own TikTok account, go with a ring light. However, if you plan on starting a YouTube channel, a Twitch channel or just want a wider light source, an LED light might be best.

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You’ll know if a model is facing a ring light by the appearance of circular catch lights (or eye lights) in the subject’s eyes. These spectacular highlights instantly make the portrait more attractive and engaging, as they instantly draw the viewer’s attention.

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Lastly, take note of the color temperature. Even if you decide to use color gels to temporarily create more fun colors with the light, you’ll want  a natural default color. Ring lights are often best in fluorescent, warm white, or even stark white lighting — instead of warm yellow or bright white.

Because ring light kits are often very affordable, they’re a great choice for content creators who maintain a YouTube channel or do live streams on TikTok, Twitch, and other platforms. If you’ve ever wondered why someone looks well-lit even when using a webcam, they’re probably using a ring light. The best ring lights are arguably the top lighting option for YouTube videos, especially for vloggers and product reviewers.

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If you’re using constant light, you can easily adjust the power and your distance from the subject. This will get you your desired effect before clicking your shutter. If you’re using a flash version, you can do several test shots to determine the changes that you need to make. Think: distance and light strength.

Photographers use ring lights for other types of creative lighting setups that don’t necessarily require you to shoot through it. Just take a look at this video from Daniel Norton for AdoramaTV:

It’s not difficult to imagine that a high solid angle light can become an increasingly lower solid angle and less intense light (inverse square rule) as the working distance is increased, effectively turning it into a more directional point source!

Virtually every serious makeup artist on YouTube uses a ring light kit for makeup tutorials. These lights instantly enhance facial features and help show the true colors of the skin as well as the products. Artists simply place their makeup ring light in front of their cameras (or camera phone) and record away. Makeup artists also use ring lights while preparing models and brides for photoshoots.

Ring Light for Laptop

Fiber optic based solar lighting will help to bring natural sunlight into a building. Effectively speaking one can store sunlight and then use it indoors.

Lighting is a key component not only for content creators but also for those work-from-home meetings. If you plan on being in front of your computer’s webcam for an interview, you’ll definitely want a light to add some clarity. The major difference between an LED light and a ring light is mainly the shape. LED lights will tend to have a more rectangular shape, whereas Ring lights will be in the shape of a ring.

While the Diffuse Dome Light is very effective on specular, curved, and topographic surfaces, and the Coaxial Light is effective for specular, flat, and angled surfaces of varying heights, both techniques have very specific application criteria that can present a challenge under some lighting circumstances.

However, keep in mind that if you’re making a constant ring light, you’ll need to brush up on bulb types and use the right materials. That way your DIY version will be safe for repeated and prolonged use.

Some ring lights can plug directly into your computer and some can be plugged into the wall. Find out which one you prefer. A light with a wall plug frees up your USB ports for more peripherals. Once you use your ring light for the first time, you’ll never go back.

Before going into your meeting, check your Zoom video preview settings. Play around with the ring light’s brightness and make sure it’s enhancing your features rather than making you look like too bright. Turn off any outside lights that you have on, as your light will be enough. This will also help your camera focus more on your face.

Once your subject is ready, simply place the ring light in front of your camera. Whether you’re using a camera phone or a more professional camera — like the Sony Alpha a7 IV, Panasonic Lumix GH6, and Canon EOS R5 — make sure you position the lens right in the center of it so you get even lighting on your subject every time. Use a clip or even a stand or tripod to hold your camera and ring light in place.

A constant ring light is easier to adjust, because what you see is what you get as far as power and quality of light. Strobe ring lights that flash with every click of the shutter can help you save power, but may involve a steeper learning curve.

Advanced illumination offers a diffuse source to address the application shortcomings of other diffuse, bright field lights: the FX0808 Flat Diffuse Light and FD0808 Back-lit Flat Diffuse Light.  These Flat Diffuse Lights are a highly diffuse source with a viewing port in the center, allowing it to be used as front, or projection light (Figure 2).

Let’s view images from samples that illustrate the advantages of applying the Flat Diffuse Light versus other diffuse lights, including a Diffuse Dome Light and a Square Coaxial Light.

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The image depicted in Figure 6E demonstrates that the DL097 Diffuse Dome Light effectively illuminates the tray at longer working distances.  But for larger sampling areas, we still require larger domes, which can be bulky, expensive, and may require longer lead times.

For illustration purposes, we can see the 2-D matrix code in close-up views (See Figures 5A–5D).  A 2” (50 mm) working distance is necessary for the code to be read and verified with a standard resolution CCD camera, while also being typical of the working distances required for effective diffuse and coaxial source lighting.

Figure 7A illustrates the entire tray lighted using the FX0808 Flat Diffuse Light at a 12” (305 mm) working distance.  In conjunction with a high-resolution CCD or CMOS camera, the FX0808 provides for a very robust and efficient inspection solution for larger fields of view.

INLINE is a recessed linear light fixture combining modern laconic design and high illuminating performance. It can be used for private or public interiors.

Professionals in portrait photography absolutely love these lights. They offer more diffused, soft light on the subject, while reducing the appearance of harsh shadows. Those functions alone make this a popular lighting choice for close-up portraiture. Ring lights can make your subject “pop” without washing out or changing the contours of the face in a way uneven lighting would. That makes these lights the perfect selection for portraits and selfies.

2) to maintain a high solid angle for even light distribution over curved or topographic surfaces, the low angle component from the dome interior must also be incident on the surface.

To maintain sufficient incident light intensity, uniformity, and angular distribution, Diffuse Lights are best placed close to the intended inspection surface.  This is particularly crucial for the Diffuse Dome Light for two reasons:

Ringlightwith Tripod

Ring lights can be purchased as existing kits and fixtures, but there are also many tutorials on how to make your own DIY ring light. Ring lights are generally available in two formats: strobe and constant. Strobes are usually used for still images, while constant lights are the best ring lights for video content creators.

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If we instead apply the same lighting schemes to a longer working distance view (Figures 6A-6E & 7A), one that may only require 1-2 image frames per tray, we see that only the Flat Diffuse Light and the DL097 Diffuse Dome Light are effective (Figures 6D & 6E, respectively).  Of course, a much higher resolution camera would be necessary to resolve the 2-D laser etched codes.

You can use clip-on selfie ring lights even when recording with a cell phone or tablet, making them a great inexpensive and portable option.

Before you buy a 3D Time-of-Flight or ToF sensor or camera, discover how this accurate, privacy-respecting technology works.

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For example, a lightguide collimator can project light from a lightguide into a uniform spot in free space. High-numerical-aperture aspherical lenses are used ...

Professional Ring Light

Ring lights can be used for a variety of purposes in photography and videography. They also provide plenty of light for other professional uses. Here are some of the most common uses and considerations for the best ring light use.

Specifically, as illustrated in Fig 1A, a Diffuse Dome Light illuminates from nearly an entire hemisphere; hence it is described as having a relatively larger “solid angle”  than the directional Spot Light depicted in Figure 1B.

A ring light is a simple lighting tool that is commonly used for beauty shots, portraits, and macro photography. It features a number of small bulbs forming a circle or just one circular fluorescent bulb. When used in photography, it creates an attractive catch light on a subject’s eyes. At the same time, it emits even, diffused lighting, similar to a softbox, that helps eliminate shadows. You can position this light in front of the subject, with the camera situated in the middle of the circle.

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We also see that this short working distance contributes to an effective lighting geometry.  However, this is not an efficient sampling strategy, as the 75 x 125 mm tray would require multiple X & Y traverses to inspect the entire tray.

We see that the Diffuse Dome Light and Flat Diffuse Light work equally well for relatively small areas of the PCB (Figures 3A & 3B).  In comparison, the large Diffuse Dome is less effective than the Flat Diffuse Light on larger fields-of-view, primarily because the dome has to be oversized by at least 50% of the intended field-of-view size (Figures 3C & 3D).

Surfaces prone to uneven reflectivity are often challenging to inspect – particularly with bright-field point sources commonly used in machine vision systems.  To achieve more uniform contrast over such surfaces, one solution is to apply diffuse lighting techniques.

UV adhesives are acrylate- or epoxy-based resins which polymerize and thus cure by irradiation with special UV light sources.

PCBs can be challenging to illuminate correctly, particularly those with large or odd-shaped components, like capacitors or heat sinks. Figures 3A-3D illustrate the differences among the three diffuse lighting options: dome, flat, and coaxial.

For macro photography, these lights offer a slightly more front-focused lighting compared to a lightbox. Simultaneously, they distribute light around a small subject well enough to hide shadows and bring out more detail. With the right color temperature, a ring light can supplement natural light seamlessly. Kits are commonly used for floral and insect photography.

Another typically challenging part to illuminate effectively is the biomedical culture or sample titer tray. These parts are often presented on a tray with a matrix of regularly spaced wells of varying size and depth. In this particular example, the wells are relatively small (5 mm wide) and shallow (3 mm deep), and spaced at approximately 8 mm in X and Y. Additionally, each well has a laser-etched 2-D matrix code that must be read and verified by a vision system as part of an FDA-requirement for sample correlation and tracking history.

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As discussed in our previous Lighting Education Blog Post, diffuse lighting in machine vision applications may be classified as full bright field illumination as opposed to partial, or directional bright field lighting.  The underlying concept behind full bright field illumination, defined as illumination with a larger “solid angle”, is that light is sourced from a large area and is incident on the object surface from multiple angles (Figure 1A).

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Figure 4 illustrates the limited size application of the 2”x2” Square Coaxial Light, where large size and set working distance are critical.

Another thing to know: the power and size of the ring light does make a difference. If you want visible catch light on your subject’s eyes for portrait photography, you’ll need a much bigger ring light. However, smaller ring lights will give you the same effect if you’re going to do a lot of close ups. As for the power, it’s usually best to get one that has a dimmer. You will be able to easily adjust the power depending on the distance between your ring light and your subject.

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The FX0808 light is part of the Ai “Expandable Series” of lights.  This enables our team to build a light of this type from 1” x 1” (25 x 25 mm) to 24” x 24” (610 x 610 mm) in 1” (25 mm) increments, all available in 2 weeks.