FresnelSheet

Named after its inventor, Augustin-Jean Fresnel, these lights have been a cornerstone in stage lighting for decades, providing a soft, controllable glow that enhances performances and captivates audiences, but what is a fresnel, and when should you use them?

NOTE: Do not place ND filters in series with their surfaces parallel. Parallel surfaces may cause multiple internal surface reflections which can combine to cause an increase in transmittance; this is especially true of the metallic type filters.

Fresnellens

Ultimately, the choice between LED fresnel and LED ellipsoidal lights will depend on the specific requirements of your lighting design and the effects you wish to achieve.

Fresnelglasses

Ultimately, the choice between LED fresnel and LED par lights will depend on the specific lighting requirements of a given production or application. Each type has its strengths and may be chosen based on factors such as the desired beam characteristics, flexibility, and the overall lighting design.

These ND filters attenuate by absorption (and Fresnel reflection, the constant reflection from the air-glass interfaces). The absorption is iconic in anature so this type of density filter follows the Beer and Bouguer"s Laws.

How does aFresnellens work

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Solid glass absorptive ND filters are relatively neutral in the 400 to 700 nm range. They are usable from 350 nm to 2500 nm, but the transmittance is different from that expected from the density value. Since most of the incident energy is absorbed, there filters produce fewer problems from multiple reflected beams comparing to the metallic type, but they are intended only for use with lower power sources.

What is aFresnellens used for

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Fresnel lights are celebrated for their ability to produce a soft and even wash of light, making them ideal for general stage lighting. The design of the fresnel lens allows for a smooth transition between the center and the edges of the beam, resulting in a gentle and uniform illumination across the stage.

Fresnelprism

LED fresnel lights and LED pars are both popular lighting fixtures. Each type has its own characteristics and advantages, and the choice between them depends on the specific requirements of the lighting application. Here are some key differences between LED fresnel and LED par fixtures:

Neutral Density filters can be stacked in series to produce higher densities. The total optical density is the sum of the individual densities. The total transmittance of a stack of neutral density filters is the product of the transmittance of each filter.

Fresnelpronunciation

Optical Density (OD) is defined as the logarithm to the base ten of the ratio of the power of the incident beam to that of the exiting beam. The optical density can be convert to transmittance using the following equations:

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FresnelLight

Neutral density (ND) filters are used to equally attenuate the intensity of a light beam over a wide wavelength range. ND filters range from colorless to gray in appearance. Metallic neutral density filters provide a relatively consistent degree of attenuation over a wide spectral band. We offer a variety of catalog ND filters for UV/VIS applications including absorptive, metallic on glass or fused-silica, and variable linear or circular, as well as filters for infrared applications.

In the world of theatrical lighting, Fresnel lights have proven to be indispensable tools. Their soft, even illumination, variable focus, and efficient light output make them a timeless choice for enhancing performances and creating captivating visual experiences. As technology advances, the enduring appeal and practicality of Fresnel lights ensure their continued prominence in the ever-evolving landscape of theatrical and house-of-worship design.

Brandon Vaque reluctantly grew up around AV, being dragged as a teenager to work at his parents AV house to build a "good work ethic." After college, he did what he swore he would never do, and started working at the family business. He helped launch the Springtree LED brand, with his passion being to simplify the AV process.

The key feature of a fresnel is a fresnel lens. The distinctive stepped design of the lens enables the light to be collimated into a parallel beam, resulting in a concentrated and directional output. The Fresnel lens allows for easy adjustment of the light’s beam angle. This makes it possible to focus the light tightly or spread it out more diffusely, providing flexibility in shaping the illumination to suit your specific need.

Shop and browse all of our standard Neutral Density Filter models, or select a product series below for more information on our products and capabilities.

We design products only where we see a need, and while there are many brilliant high-end fresnels, there was a need for an affordable fresnel that is extremally high quality. We are excited to introduce to you the Spartan300-VW. Watch the video to learn more 🙂.

The metallic ND filters use a thin coating of inconel on a glass or fused silica substrate. The inconel material contains a number of different elements such as nickel (Ni), chromium (Cr), cobalt (Co), and iron (Fe). Careful control of the alloy composition and vacuum deposition produces coatings which are spectral neutral over a wide wavelength range. The metallic ND filters are generally more neutral comparing to the absorptive type of ND filters. UV Fused silica substrate are useful in the ultraviolet spectrum, while the cost effective B 270 optical glass substrate provides excellent performance in the visible and Near-IR spectrum range. Always use these filters with the reflective side facing the radiation source. The metallic ND filters withstand higher power and thermal shock better comparing to the absorptive type. These filters are spectrally neutral beyond 2 µm.