How many of you have a light meter? Probably very few. How many top cinematographers have light meters? Probably all of them. There’s a reason this tool has stood the test of time, because it’s great. Using a light meter is a fantastic way to make sure you know how much light you need to use to correctly expose your subject, particularly useful when you have a bright background and you want to make sure you can expose both the foreground and background at the same level.