Thanks for the response, David, and that's that for tungsten film. You're saying I can use outdoor film, 80A filter, and tungsten lights. One further question to you or anyone, please...when using a daylight film, can the bulbs known as "daylight" bulbs (the glass has a blue cast to it) be used in place of tungsten bulbs--T bulbs look fairly expensive (500 watts), and my hardware store sells these daylight bulbs, though albeit a lower wattage (125 watts--I figure I'll just move them closer). My neighbor thought the daylight bulbs might be for growing plants.