If I am shooting in a room and i want to use the lamps that are in it and natural light from a window how do I know if I need to use filters or not for the film stock. If it is balanced for tungston how do I determine that I have 3200 degrees and not 5500 degrees K? Does anything like this also apply to HD cameras? When I here 5500 degrees K what should I think in terms of getting the best shot and how do I measure this? Is this what the light meter is all about? Can you break it down a little into steps. Like, step one you turn the lights on in the room ... and then what if I want some really black dark corners but I want the shadows in them. I guess I am getting all over the place but to start with i want to get a grip on light and the color and intensity is the starting point, right? so how do i measure these and how do I know how much I need for camera and film stock?