(Quoted from Kieth Stevens, Contributing Writer for Impressions Magazine. Full article here.)

My background is in haftone photography, and when I was using this old-school technology, it was imperitive to have the proper light in the dark room where the film was handled. 

It also was extremely important to have no unfiltered light entering the room either from cracks under the door, a vent or any other source. The film must be protecte and instide its original box if ever the door was opened.

Click here to read the full article