CLEAN: 'Lost' Hitchcock film found in New Zealand

The video tutorial discusses the preservation of films, highlighting the remarkable condition of some old reels. It explores the distinctive stylistic touches of Hitchcock, which are evident in his later works. The significance of lost films, such as 'White Shadow', is also addressed. The tutorial explains film tinting techniques and the importance of lighting. Finally, it covers programming techniques used in modern feature films.

What is the importance of the light source mentioned in the text?

How does the text describe the process of programming in modern features?