Ever wonder what those gel sheets in the advanced lighting kits are for? They help "fix" lights to work with ambient or background light. Basically, if room lights have a different color (or, more technically, temperature) than the lamps in the kit (such as daylight [more blue] or fluorescent [more green / orange] the gels can adjust the lamps to match.
You can find out more from this Lowel EDU page:
http://www.lowel.com/edu/light_controls/gels.html
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