How to put together a Lighting Kit for Video (Part Three): Light Modifiers
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In Part One we looked at ways to quantify light to determine how much intensity we need.
In Part Two we looked at the different types of light, and what they bring to the table. We also covered hard vs soft light.
In this part we’ll look at light modifiers and sources, and how each type of system affects the overall result. Based on this information, we will be able to put together a lighting kit for video.
When you start reading about lights and the different types of lights, you get the feeling there’s too much to cover. If you are a newcomer, you might be overwhelmed. Do you really need to know all this stuff? Actually, you do. But the good news is, you don’t have to know all of it right now.
Think of these new terms as playing cards spread on a table. You probably remember the first time you saw all these cards, suits, etc., and thought: “What the heck is all this?” This article will have a similar effect, and the simple way to deal with it is just stand back and look at it from afar.
You don’t have to memorize the following terms or commit to anything at this point. You’ll have enough opportunities to familiarize yourself later.
The Case of the Imaginary Wall
If space decides how much light you need, space also decides where you are allowed to place your lights. Look at this:
There is always a subject, and there is always a light source (even the sun or moon is a source). The imaginary wall is something that limits the relationship between the two.
For interior locations, this is pretty much obvious. The walls of the room or studio you are shooting in limit the placement of your light source. You can’t put it outside, can you? This same analogy applies for the sun as well. It’s always there, but your subject might be indoors, and the imaginary wall limits it (windows) or blocks it entirely (real walls).
When you’re in an exterior location, you still have the imaginary wall. You might have trees, other buildings, roads, etc., blocking the sun. If you aren’t relying on the sun, and have light sources of your own, you are limited by where the generator can park, edges of where you can place the light (riverside, roads, and so on), laws, power sources, cables and so on.
No matter where you’re shooting, you always have an imaginary wall at a certain distance from your subject. This wall limits
Bounce vs Diffused Lighting
Interior lighting is designed for diffused light (soft light). We no longer use raw tungsten bulbs in our homes or offices (or do we?). Take a look around you. You’ll see fluorescent banks in offices and public areas. You’ll see tungsten or fluorescent sources diffused by lamp shades in homes, and you’ll see LEDs, tungstens or fluorescents in shops, malls, etc.
In regions where sunlight is mild (north light away from the Equator), you have normal glass windows. In regions where sunlight is harsh (Equator) you have windows either tinted or frosted. Obviously, this system isn’t followed half the time, because not all architects agree on how light should be used. At the very least, we have roofs over our heads so the noon sun is rarely in our interior spaces. That’s a start.
For this reason and more, recreating the effects of soft lighting is extremely important. For situations that are dramatic, or which have to justify the sun as a source, hard lighting is extremely important. You need both kinds of lighting in your kits.
The two ways in which we can soften light are:
Look at the basic difference:
Look at image A. Due to the proximity of the imaginary wall, you might not have enough space to put a diffused light between it and your subject. You might have other limitations, like e.g., the light source might be visible in your frame, etc. When we place lights, there’s always a certain amount of ‘tweaking’ involved. This tweaking is done in a physical space – you move lights around, you rotate them, you change the angles or heights, etc.
In simple terms, an imaginary wall restricts your freedom. Look at image B. When you’re faced with an imaginary wall you can bounce (reflect) light off the wall. This ‘wall’ could be an actual bare wall, or a wall covered in diffusion material, or a foam board, or a reflector, etc. More on these later.
As a general rule of thumb, when you have more space, you can diffuse light and move it around. When you don’t have space, it is easier to bounce. There is no such thing as ‘one is better than the other’. A good cinematographer must know how to use both, and a good lighting kit will have allowances for both. That’s the only point I’m making.
An early decision most cinematographers make on any project is to segregate their use of hard or soft lighting, and then (after having seen the actual locations) decide how they are going to tackle the problem of soft lighting.
A beginner isn’t expected to have the experience to know how to tackle all scenarios. Usually, you learn as you go, and handle problems on a case-by-case basis. The idea of a beginner lighting kit is to have sufficient resources at hand to at least give you a shot at tackling these problems.
The Light Source
A diffusion system is one which forms an integral ‘alliance’ with the bulb. Together, they diffuse and shape the light. In essence, the combination behaves like a single source.
E.g., look at this simple difference:
You could apply similar concepts to get a softbox:
A softbox is nothing but a diffusion element in front of a lamp/bulb to soften the source. You could call the ‘combo’ a single lighting source. You don’t have to get too technical with your definitions here. No one’s going to ask you these things on the field. I break it down this way for easy understanding. Learn, understand, and then forget!
Bounced light can also be called a single source. If you step back and look at diffused or bounced lighting sources, ultimately they all achieve the same purpose – which is to soften the light given the constraints of the space created by the imaginary wall.
I’m not going into the details here, but for quick reference, here are the most popular diffusion systems:
Hard lights are usually called Open-faced, simply because there’s nothing between the light source (bulb) and the subject. Open faced systems are used for hard lighting and to bounce light off diffused surfaces.
We have many cards on the table already. There’s more.
Once light has left the source, you might still want to modify it for many reasons. Some of the prime reasons are:
Sometimes the modifiers are on the light source itself, so the distinction is usually a gray area. Who cares?
Here are some popular light modifiers:
When you have the time, Google these terms and take them in slowly. Some are extremely handy, while others are used only for specific scenarios. Once you’ve played cards long enough, they become second nature. Take your time.
In Part Four we’ll finally pick and choose, and put together our first lighting kit.
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April 3, 2013