[QUOTE=Ian Grant]Nick
Have you considered that these low enrgy bulbs
take quite a while to start...

I'm going way back for this one; the late 50s. The government
surplus F. tube 4 x 5 I bought must have been at least a few years
old when I got it. Five, IIRC, small diameter tubes and no warm-up,
no shutter. There are tubes and then there are tubes. How about
the 1/8 inch tubes? Up to a foot long. Dan