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Author
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Topic: question about FTL: what level should be ideal ?
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Scott Norwood
Film God
![](http://www.film-tech.com/ubbmembers/30f.jpg)
Posts: 8146
From: Boston, MA. USA (1774.21 miles northeast of Dallas)
Registered: Jun 99
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posted 07-23-2010 08:10 AM
I recently acquired a light meter (and had it calibrated), and measured the difference between "open gate" and "clear" film last week. It's not much--roughly 1/2 to 1 fL, with clear film. I don't remember if it was color or B&W stock, however--perhaps that meks a difference. One thing that did make a difference was how long the xenons had been lit--they get noticeably brighter after the first few minutes of operation.
Out of curiousity, I measured some computer monitors as well--a 20" CRT is about 40fL, and a 20" LCD is about 45fL. I don't know how this relates to film exhibition, though, since the light is coming directly from the monitors, but is being reflected off of the screen.
(Incidentally, everyone should have a light meter. It significantly improves the results of lamphouse alignment, while making the task considerably easier.)
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