Yes. But I see you mention 40w. I have no idea where you would even get a 20k normal output fluorescent bulb. Maybe they make them...dunno. I used to order Philips TL 40w/03 RS "Aqua Coral" bulbs from my local electric supply for about $15 and you can go to HD or Lowes and buy a 65K daylight bulb for like $4.
As far as PAR on a normal output fluorescent....not much and I doubt anyone ever bothered to test them. There are PAR readings for T5's in that RC thread and PAR for MH
on Sanjays site.