Jonathan Wilcox

Yeah makes a lot of sense. I was doing a test with a light meter and a large soft source and the numbers were way off from the inverse square law equation.

Does the inverse square law apply to all lights? Including diffusion panels, chimeras, fresnels, pars, source 4, natural daylight coming from a window, etc.? Does the law change at all when dealing with lights such as Pars (that are supposed to have longer throw capabilities?) What does 'throw' have in relation to inverse square law. And in what situations would you use a light with more throw and in what situations would you use a light with less throw?

Thanks Guy, you are an amazing resource of information.

Excellent advice Ron.

Is it possible to exchange electronic ballasts - for example, using arri electronic ballast with ltm light, or strand ballast with arri light, etc.? What are some precautions to take when using electronic ballasts? I am quite familiar with magnetic but have not yet used electronic ballasts.

This can be done very simply and effectively using dimmers.

I love how natural the work of Harris Savides and Lance Acord are. They don't use all natural light but they effectively augment natural light with movie lights. If you haven't read the book New Cinematographers yet, it is an excellent read. Also check out this interview http://www.createasphere.com/En/panels/item/14-lance-acord-asc-and-jon-witmer-associate-editor-at-american-cinematographer.html And check out these podcasts: http://www.theasc.com/ac_magazine/podcasts.php