Mathematical Fomulas (2 replies and 1 comment)
What are the most useful mathematical formulas when in pre-pro to help you with your lighting plan and finding out how much equipment you might want and where to put them? Would I need a photometric chart of all the lights available for me to use?
I've read all your looking at lighting plans and always wonder how do you know how many lights you need and how far you know to place them.
Well it depends on the scene that you want to shoot and what you wanna tell, also it depends on how big or the place is.
For me I don't do any fancy or magical stuff, I just check the location that we are shooting, have a chat with the director about where the actors gonna move, plus I have chat the production design team to see if there's something important that I should light, and then I start working with my light gaffer team to light as the story tell us, sometimes I use one light other times I use five or three well it all depends, and that's my why of how do I light a location whither it's a big place or small place.
That's partially my point. It's for budgeting reasons, if I go onto location and want to hit a certain exposure I'm going to need to know how many lights I need and how far away I'm going to put it. There's definitely multiple ways of deciding what to use but I'm particularly interested to know if Roger does use any maths (and what basic formulas they are) in calculating what he'll need and where to place the lights in order to communicate with the gaffer.
It would probably be much more crucial on larger sets like his where you can't just set up 10 HMI's and "move them abit furthur back" or "move them over there". You'll definitely need some sort of concrete calculation to know that you'll hit your intended exposure with what you have and where you put it.
There is some wiggle room between scrims to darken and spotting in to brighten, not to mention the f-stop on the lens. Of course, you have to know if you'll have enough.