i have the solution! had the same prob with pc case flourescents. buy this:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...776110627&rd=1
It means you can dim it however much you like as well. just cut the end off and join the wires.
Batteries will run out very quickly, and if you do use 8 x 1.5v, make sure you wire them in parallel not series, or you'll just get a very dim light that lasts forever!