Was given this Aquarium lamp which originally made for use in Japan and have
been using it here in the U.K. plugged into a 100volt transformer. Its now
flickering on and off like there is no tomorrow.

Presumably I can buy a new similar lamp which works on 240 volt rather than
100volt? But what to do to replace this item which says Ballast on the
label?

Photo of all the bits on a host web site

http://tinypic.com/view.php?pic=15q65uv&s=5


On the cover it says: 'Ballast', M/No. PL13-1005/6 PL13W x 1. Imput:100V
50/60Hz 0.285A.

And on the Lamp it says: Aqua Lux 13W 7200K

Grateful for any advice on how to set it all up to work on 240 volts.
Thanks.