Anyone know a conversion formula for fluorescent lights? I know that if a fluorescent light is rated at, say 20w, while it draws 20w of power, it puts out a comparable amount of light to a much brighter light. I believe that also there is a law of diminishing returns on power output - ie, if a 20w light puts out the equivalent of a 100w incandescent, a 55w does not put out 270w, but rather some amount less. Does anyone know a formula for either of these ratios? I'm looking at getting some fluorescent lights to use as a constant light source for doing wet-plate in the studio, and I'm trying to figure out how much power various fixtures put out, and without a standard of comparison, looking at fluorescents is almost as confusing as trying to compare strobes across various manufacturers.
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