Fresnel light. Medical search. Frequent questions

Augustin-Jean Fresnel and François Arago, both discovered the laws, which bear their name. (wikipedia.org)

These lenses were used in coastal lights and for marking sounds. (terrypepper.com)
Of the twelve such lenses incorporated in US Lighthouses, seven were installed in Lights on the Great Lakes. (terrypepper.com)
The units also come with interchangeable and optional fresnel and spot lenses, allowing for a variety of creative and practical setups. (digitalfilmmaker.net)
In your letter dated October 19, 1995, on behalf of Detection Systems, Inc., you requested a tariff classification ruling on plastic fresnel lenses. (faqs.org)
The plastic injection molded fresnel lenses are used in passive infrared sensing intrusion alarms. (faqs.org)
The fresnel lenses gather infrared energy radiated from an intruder and direct it to an infrared sensor. (faqs.org)
The lenses also act as a visible light filter. (faqs.org)
The part numbers for the fresnel lenses are 28881B and 28882B. (faqs.org)
Fresnel lenses are nifty contraptions, and very popular with DIYers tinkering with solar power, among other uses. (survivalup.com)
Basically these lenses are covered with lots of mini-lenses which will ultimately focus light similar to the way a magnifying glass does. (survivalup.com)
This item is 5-pack of 7" x 10" Fresnel Lenses which can be used to supply a whole family with a fire starting lens. (survivalup.com)
With 70 square inches of sun collecting area, these Fresnel lenses have much more light focusing power than a solar lighter. (survivalup.com)
In fact, on a sunny day Just one of these 7" X 10" Fresnel lenses can start a fire in seconds! (survivalup.com)
And the extra light gathering capability of these Fresnel lenses makes them especially useful to even dry out wet or damp tinder. (survivalup.com)
With 350 squares inches of total light gathering area, focusing all five lenses at once on a small container of water could even cause the water to boil. (survivalup.com)
Fresnel lenses may get a bad rap as being fragile, which for obvious reasons could cause some survivalists and doomsday preppers to shy away from using them. (survivalup.com)
Stored with some caution to avoid sharp metal object from gouging them too much, these Fresnel lenses will be ready to get your survival fire raging in seconds. (survivalup.com)
Unlike Fresnel lenses which are refractive, this solar lighter is a parabolic reflector. (survivalup.com)
Fresnel Lenses are used in many light collection applications, such as condenser systems or emitter/detector setups. (edmundoptics.com)
Fresnel Lenses are optical lenses consisting of a series of concentric grooves etched into a plastic substrate. (edmundoptics.com)
Fresnel Lenses are typically not used as magnifier or projection lenses due to high levels of distortion. (edmundoptics.com)
Edmund Optics offers a variety of Fresnel Lenses designed for visible or infrared applications. (edmundoptics.com)
Cylinder Fresnel Lenses are also available to focus in only a single dimension. (edmundoptics.com)
Fresnel lenses can either be positive if converging or negative if diverging. (globalspec.com)
One of the big issues with Fresnel lenses is that they require focusing. (diyphotography.net)

The rear lens focuses and magnifies the beam onto its larger 10-inch glass front Fresnel lens with zero wasted light. (lensprotogo.com)

Having a large Fresnel lens, the Broncolor Flooter is the classic spotlight as known from cinematic photography. (theflashcentre.com)

The Aputure F14 Fresnel is an electronic A-Mount Fresnel modifier with a large 14-inch (350mm) diameter lens and a motorized 18º-45º spot-flood beam angle range. (hotrodcameras.com)

Who should we e-mail when a Aputure F10 Fresnel Attachment for LS 600d LED Light becomes available? (lensprotogo.com)
The Aputure F10 Fresnel Attachment gives your Aputure LS 600d light a beam spread that's variable from 15 to 45° while also intensifying its light output. (lensprotogo.com)
The dual-lens optical design enables the LAOFAS Fresnel attachment to highly Increase the brightness of LED video light. (pergear.com)
By utilizing a rotating barrel design, the LAOFAS Fresnel attachment creates an intuitive user experience, similar to a camera lens. (pergear.com)
the LAOFAS Fresnel attachment offers a beam spread that's variable from 12 to 40 degrees to realize the flooding and spotlight, you always get sharp edges at all angles. (pergear.com)
The LAOFAS Fresnel attachment is adaptable to any situation. (pergear.com)
The LAOFAS Fresnel attachment adopts high-temperature resistant material, which can withstand a certain degree temperature (300Ws LED or under). (pergear.com)

Wall and ceiling lamp only for interior giving direct and diffused light. (oluce.com)
The Fresnel is an outside floor lamp giving direct and diffused light. (dlaguna.com)

With its large size, the F14 Fresnel also includes a detachable yoke for better balance and ergonomics when mounting the fixture to a stand, as well as a safety chain for added security. (hotrodcameras.com)

Part of the expanding line of Fresnels, the Fresnel Studio Series LED200 Daylight from Dracast has the same quality features as its larger siblings like the Fresnel 2000, but in a smaller lighter package. (diopte.com)
Instead of using filters, the Fresnel 2000 can vary the color balance from 3200-5600K or anywhere in between with the turn of a knob. (dracobroadcast.com)
The Fresnel 2000 comes with a 5/8″ receiver for hanging or stand mounting. (dracobroadcast.com)
I just sold my Joker 800 HMI and bought the Fresnel 2000. (dracobroadcast.com)
Really happy to get this Dracast Fresnel 2000 Bi-Color LED Light! (dracobroadcast.com)

You can fine-tune the beam angle of each light with a knob on the back of the fixture. (recordingstudiolondon.co.uk)
And when used in conjunction with the included sled for the Electro Storm CS15 and XT26, the F14 Fresnel and combined fixture can be placed onto flat surfaces. (hotrodcameras.com)
It's high power light output, high CRI, DMX, RDM control, soft wash effect make this fixture a perfect replacement of the traditional 1K fresnels. (ovationlights.com)
The Fresnel Studio LED2000 is a high-output LED fixture that runs cool to the touch and consumes a fraction of the power of a traditional halogen fixture, resulting in lower HVAC running costs in the studio and a quick return on your investment. (dracobroadcast.com)
The cool white and warm white light has a colour temperature range of between 2700k - 6500k, making this light fixture perfect as a production light. (stageconcepts.co.uk)
This small but powerful fixture includes RGB mixing in its light source but also amber and mint LEDs to fill the typical gaps of a LED spectrum and get rich whites in all different color temperatures. (sgmlight.com)
It replaces heavy traditional lights with a cool-running, low power draw, high color rendering fixture. (threeriversvideo.com)

Aputure has announced two new LED fixtures with spot and fresnel modifiers for powerful, controllable lighting. (digitalfilmmaker.net)
In conclusion, the LS C300D II and LS C120D II are two powerful and versatile LED fixtures with spot and fresnel modifiers. (digitalfilmmaker.net)
Light modifiers can really improve your lighting and help you create just the kind of mood you're looking for. (profoto.com)
Profoto is a world leader not only when it comes to flashes, but also when it comes to light modifiers. (profoto.com)

Additionally, the company has partnered with Quartzcolor to produce new LED Fresnel fixtures for broadcast and studio use: the Studio X Litepanels. (recordingstudiolondon.co.uk)
Designed for Aputure's all-new high-output A-Mount point-source fixtures, the Electro Storm CS15 and Electro Storm XT26, the F14 Fresnel optimizes and amplifies the light output, providing smooth, remote adjustability and a beautiful light quality only achievable with large Fresnels. (hotrodcameras.com)
In addition to communicating data for motorized focus control, the A-Mount also communicates with the Electro Storm CS15 or XT26 to communicate calibration data, that the fixtures can use to optimize the accuracy of their light engine output. (hotrodcameras.com)
There's no learning curve when swapping out L7-C LE2 fixtures for fixtures with standard Fresnels. (losangelescamerarentals.com)

A small lamp, a 10 centimetre diameter spot on the wall which can fit into the palm of your hand, with glass that is really a lens, a Fresnel lens. (oluce.com)
Suitable for both outdoors and indoors with high protective ability which makes it perfect for damp environments, the Fresnel is a lamp designed by Joe Colombo to pass unobserved. (oluce.com)
CREE lamp beads, uniform and lasting effect light. (aviteh.eu)
6. Using energy-efficient imported LED Japanese lamp and high-purity aspherical glass lens, uniform light spot, high brightness, high CRI (Ra≥90, Max can be 97). (theonestudio.com.cn)

Its smooth focus throw lets you accurately tweak your light source's beam angle, making it easy to spot or flood out the light with a twist. (lensprotogo.com)
The smooth focus throw gives users an ability to accurately tweak the beam angle of their light source, allowing them to easily spot or flood-out the light with a simple twist. (pergear.com)
By doing this, the G-4 Wash delivers the best light output for the size of its lens, which is also the natural beam angle for this kind of moving head. (sgmlight.com)
Yuying can design the size of the LED lens according to the needs of customers, and the light output angle can be adjusted to reduce the cost of mold opening. (mymagnifier.com)

The dual-lens optical design has built-in ventilation to prevent overheating while thwarting spill light. (lensprotogo.com)
Built with a large 14" diameter Fresnel and its dual lens optical design, like other Aputure Fresnels, the F14 Fresnel provides enhanced accuracy and intensity for both the Electro Storm CS15 and Electro Storm XT26. (hotrodcameras.com)

The Daylight White (5700 K) version will give you a more natural feel to any film or video and the Warm White (3200 K) assures spreading an even warm white light around the stage. (teaterteknik.se)

Fusion in chromium plated metal and Fresnel lens diffuser. (oluce.com)
It is made of lacquered aluminium support and Fresnel lens diffuser. (dlaguna.com)

At first, the British sought to outdo the new Fresnel-equipped lighthouses as a matter of national pride. (pointbetsie.org)

The Fresnel Studio LED2000 Bi-Color LED Light from Dracast is packed with the latest LED technology backed with solid construction, intuitive design and a wide 15-60 degree range of beam adjustment. (dracobroadcast.com)

According to Litepanels, the CRI/TLCI of each light is over 97, which should produce a "naturally realistic" source for lighting talent. (recordingstudiolondon.co.uk)
The LEDs are very robust and have a life span of 50,000 hrs, making these lights much more cost effective compared to other continuous lighting. (dragonimage.com.au)
LED Fresnel Spotlight are used for lighting of stage and photography. (theonestudio.com.cn)
When shooting, Fresnel spotlight is mainly used for lighting and special lighting in large areas, also lighting for characters and stage sets. (theonestudio.com.cn)
Featuring dual 50W COB LED lights, this unit delivers warm white and cool white output that's equivalent to a 300-500W halogen spot system, making it an energy-efficient replacement for outdated halogen lighting. (stageconcepts.co.uk)
This modern fresnel light blends seamlessly into any stage lighting rig, mixing with older units due to its classic barn door design. (stageconcepts.co.uk)

Litepanels has just released a new range of LED Fresnel lamps primarily designed for broadcast and studio use: the Litepanels Studio X. At launch, six models are available with output power ranging from 60 to 360W. (recordingstudiolondon.co.uk)
Americans, too, resisted abandoning their primitive lamps, but the superiority of the Fresnel lens could not be denied for long Soon, from Dunkirk to Saigon, shores were brightened with it. (pointbetsie.org)
As the thickness is reduced, the light absorption is also reduced, and the efficiency of lamps or instruments will also increase. (mymagnifier.com)
In the field of LED lights, it is widely used in downlights, spotlights, wall washers, stage lights and other lamps. (mymagnifier.com)

We know that the intensity of light goes as the electric field squared (in fact, I = ϵ v ⟨ E 2 ⟩ T {\displaystyle I=\epsilon v\langle \mathbf {E} ^{2}\rangle _{T}} , where the angled brackets denote a time average), and so we just add the fields before squaring them. (wikipedia.org)
The new Rayzr 7 300B Bi-color combines a very bright light with the ability to seamlessly transition color temperature between 3,200 K and 5,600 K, without losing the intensity of the light or sacrificing the smoothness of the light field. (cinevision-solutions.com)

Using the control knob and display screen on the side of the modifier, the motorized F14 Fresnel can smoothly and accurately transition from a narrow, focused throw to a wider flood light for versatility across a useful range of beam angles. (hotrodcameras.com)
LAOFAS Fresnel Lens Light Modifier wi. (pergear.com)

Color temperature accurately, can double temperature continuous adjustment, the only in domestic double color temperature adjusting Fresnel spotlight. (aviteh.eu)
Therefore, Fresnel spotlight with zoom are equipped with a signal control mode, which can realize 0~100 linear dimming, color temperature from warm white to positive white conversion, zoom adjust from 15 to 50 degree and so on.Also we have the silent cooling system, hardly to hear any noise, it's very suitable for here. (theonestudio.com.cn)
7. The Led Fresnel Spotlight It is widely used in Church, T show, Theatres, Television stations, Conference rooms, Hotels and other places. (theonestudio.com.cn)

With its Bowens Mount design, it can be attached to a variety of lights. (pergear.com)
It's A-Mount because it requires electronic communication with the light to provide both power and data transfer. (diyphotography.net)

A fresnel lens with a positive focal length. (globalspec.com)

The light source adopts LED, energy saving and environmental protection, and the color temperature range is 3200K-5600K, the CRI (color rendering index) is 90, max can be 95. (theonestudio.com.cn)

3 layers of aspheric lens optical system, high light efficiency. (aviteh.eu)
LED lights, high efficiency and energy saving, more environmental protection. (aviteh.eu)
I am a professional photographer & I need more accurate caption with the energy-saving and efficiency for my light. (dracobroadcast.com)
The method of zooming and zooming while moving the zigzag lens along the light direction can achieve higher efficiency. (mymagnifier.com)

CTC 300 Fresnel is a 300W warm white + 300Watt cold white powered LED fresnel. (ovationlights.com)

Clear Fresnel glass lens. (ferguson.com)

The Boltzen 55 Watt video light shares the exact same housing as our Boltzen 30w Fresnel with the exception of a built in cooling fan to dissipate the extra heat. (cametvblog.com)
Hive Lightingâ€™s smallest and most portableÂ omni-color LED, the Bee 50-C, uses just 40 watts to produce light output comparable to a 300 watt incandescent. (threeriversvideo.com)

Our customers choose Led Fresnel spotlights for use with back lights and surface lights.Fresnel Lights with small size, light weight, its spots are uniformly distributed, and the adjustment range is large. (theonestudio.com.cn)
Due to the circular form as well as the size of the Fresnel lens this light shaper perfectly imitates sunlight in the studio. (theflashcentre.com)
Unlike other LED fresnel lights, the G-4 Wash uses a glass fresnel front lens and the size of the luminaire does not change while using the zoom feature. (sgmlight.com)

The G-4 Wash is a lightweight and compact Fresnel moving head light, capable of exceptional color rendering and remarkable output. (sgmlight.com)

Due to the adjustable of color temperature, spot and illumination of LED spotlights, the fresnel led lights can be met the different demand on every circumstances according by the user. (theonestudio.com.cn)

The Aputure F10 Fresnel Attachments is designed to give your Aputure LS 600d a beam spread that's variable from 15 to 45° while increasing overall light output. (lensprotogo.com)

Augustin Fresnel (1788-1827) shocked the scientific elite with his unique understanding of the physics of light. (pointbetsie.org)

Litepanels Studio X LED lights are primarily designed for studio use, so they all feature a 5-pin XLR DMX input, mini-USB port and RDM control. (recordingstudiolondon.co.uk)
The internal material with better thermal conductivity control allows the LAOFAS Fresnel to be used on the light for a longer time. (pergear.com)
Control stray light and reduce light spread. (profoto.com)
Here, the Broncolor Flooter can be fitted with a honeycomb grid to set light effects rich in contrast and with barn doors to control the light spread. (theflashcentre.com)
Thanks to its ventilated enclosure and intelligent thermal control, this theatre spot light operates silently. (stageconcepts.co.uk)
When used without the lens, the light becomes a wider flood and the included barn doors help to control the spill. (cametvblog.com)

The G-4 Wash is a true fresnel-based luminaire, and it delivers the same performance a user can expect from such a projector. (sgmlight.com)

Do fresnel lights produce an equally even light in spot mode as in flood mode? (dvinfo.net)
Aputure Introduces Spot and Fresnel High-Output LED Lights! (digitalfilmmaker.net)
Ideal for short-distance wash requirements and theatre spot light effects, this production light comes equipped with a manually adjustable 25-90 degree zoom. (stageconcepts.co.uk)
Like the traditional hand-made fresnel projectors, the G-4 Wash creates sharp defined shadows in flood position, and diffuse silhouettes in spot position. (sgmlight.com)

Creates soft and hard light, and everything in between. (profoto.com)

Shine an ever-loving light on you. (dvinfo.net)

Users can further shape the light and reduce spill from the Fresnel using the included Barn Doors. (hotrodcameras.com)

Boasting 16-bit digital dimming via DMX and an adjustable flash rate of 1-19Hz, this professional fresnel light delivers exceptional output and performance. (stageconcepts.co.uk)
Invest in the BeamZ BTF50Z for a reliable, versatile, and economical light solution that delivers exceptional performance every time. (stageconcepts.co.uk)

The effective focal length is the distance from the lens the light converges. (globalspec.com)

The color accuracy, color temperature is exceptional than other light. (dracobroadcast.com)

The G-4 Wash is the first moving head able to achieve a coherent and qualified light spectrum in all color temperatures by only using 5 colored LEDs. (sgmlight.com)

The Cantata LED Fresnel Full Color (FC) is a modern LED theatrical Fresnel designed for midsized applications. (vari-lite.com)
Color Temperature Orange Kit to balance created light with ambient light. (profoto.com)
A proprietary algorithm combines the different colors into a brilliant white-balanced light (CRI 98) and millions of saturated color combinations. (threeriversvideo.com)

The Boltzen 55w Video Light includes an adjustable Fresnel lens to help focus the light and provide a longer throw. (cametvblog.com)

The best thing to do is play with the individual lights in a dark studio and see what looks you get depending on the zoom amount. (dvinfo.net)
Controls stray light and reduces light spread from your Soft Zoom Reflector. (profoto.com)

Ideal for working close-up where less power is needed, the Fresnel 200 offers 0-100% dimming locally and high output with extremely low power draw and virtually no generated heat. (diopte.com)
The light ships with a 100-240 VAC power adapter for worldwide use and, with an optional adapter, it also runs on 24 VDC in locations where mains power is unavailable. (dracobroadcast.com)

Anatomy18

Organisms7

Diseases5

Chemicals and Drugs40

Analytical, Diagnostic and Therapeutic Techniques and Equipment31

Psychiatry and Psychology3

Phenomena and Processes47

Disciplines and Occupations7

Technology, Industry, Agriculture1

Information Science4

Health Care8

Augustin-Jean Fr1

Lenses25

Front Fresnel lens1

Large Fresnel lens1

Aputure F14 Fresnel1

Attachment7

Direct and diffused light2

Yoke1

20005

Fixture7

Modifiers4

Fixtures4

Lamp4

Angle4

Lens optical design2

Daylight1

Diffuser2

Lighthouses1

Dracast1

Lighting6

Lamps4

Intensity2

Modifier2

Spotlight3

Mount2

Positive Focal Length1

Adopts1

Efficiency4

300W1

Glass lens1

Watt2

Size3

Lightweight1

Spotlights1

Beam Spread1

Physics1

Control6

Luminaire1

Spot4

Creates1

Shine1

Spill1

Delivers2

Focal Length1

Exceptional1

Wash1

Color3

Adjustable1

Zoom2

Power2