I know this is an old thread, but I came across it while searching for the same problem.
I have purchaced these 'inline capacitors' and they remove the flickering.
From here...
http://www.ebay.co.uk/itm/281201459837?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Hopefuly this will help...