ARRI Fresnel Light
The light that I was most familiar with was the Fresnel light due to my time performing stage acting. The Fresnel is one of the more commonly found lights for film, TV and stage. The name, dubbed after the inventor Augustin-Jean Fresnel, doesn't refer to the set up itself but rather the lens encased in the body. The lens deviates from the typical smooth appearance that most other lenses would make use of and instead is built with a more rigged appearance.
As the diagram shows, the contrast is jarring however the rigged lens makes for a much more focused light. The way this works is by tilting each ring of glass towards the centre with varying degrees of angles as the circle progresses as shown in this diagram.
As a result, the light is more focused and more consistent rather than losing its intensity around the edges of the light beam. The pattern that the lens follows helps break up the light as it makes its way through the lens.
One of the most useful tools applied to the Fresnel is the 'Barn Door' that is placed on the front of the light. It is designed to bend the light in the direction that the lighting technician (or Gaffer) desires. The down side of the barn doors is that, as a result of exposure to heat of the bulb, they become very hot if left on for too long.
The most promising aspect of the LED lights are its ability to use little power yet have a strong output which is perfect for long takes as the power will take a longer time to run down as well as energy efficiency. The battery life of an LED light lasts approximately 2 to 3 hours at full charge but can also be plugged in to preserve power. The LEDs output 650-800 watts while, in contrasts, only takes in 36 watts with power consumption. The energy efficiency is very impressive and is one that I could consider for long takes in the future. As there is very little heat given off from the light, it is much easier to make use of gobos and gels.
An example of a gobo used to create shapes as light passes through the gaps.
Specifically, the DLH4 light head. This light went on to become the single best selling professional precision light source in the world. The light boasts its ability to work with a range of accessories, such as the aforementioned barn doors, in order to make the dedolight a very versatile lighting tool. The DLH4 also sees the use of Aspheric lenses, making use of a thinner lens, and improved output of light. This is clearly a powerful light that has done very well in the professional world and the versatility and strong light output is evidence of this.
Enlichrom Minilites
The Enlichrom Minilite is a light that is easy to use due to its lightweight, metallic shell, cooling fan to avoid the metal casing from getting to hot for use, illuminated on/off switch to see when the room behind the light is too dark as well as a reflector to enhance the range for which it can be used. It too can be used with barn doors as well as other additional accessories such as reflective and/or shoot-through umbrellas.
(Source: Available Lighting from Moodle)
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