Most standard fluorescent lamps, and especially the compact and spiral types, do not put out enough energy in the blue and UV region to be practical for alternative processes. I've been able to use tubes with a standard daylight phosphor (like FT20D, not the special color corrected "sunlight" phosphor) with a bit more than a stop in speed penalty over the BL phosphor for cyanotype. There are "high actinic" lamps from Phillips and others that look good on paper, but I haven't tried them. Blue phosphor bulbs (types like FT20B) work very well, but they are even more expensive than the BL bulbs and are harder to find.
Originally Posted by cperez