ATI Blue Plus
ATI True Actinic 03
Giesmann Pure Actinic 03
Giesmann Actinic Plus
UV Lighting Super Actinic
Any of these bulbs will work just fine. Actinics aren't actually measured in a Kelvin rating, but in a wavelength NM. True Actinics are in the 380-450 MN wavelength.
Actinic Plus bulbs combine the Actinic wavelenghts with a blue bulb, which gives a lil' different look than a true actinic.