This may be me just having a bad day but installed 12 MR16 24V downlights, customer requested led, ordered them from toolstation as it was literally two second walk. all connected and fitted etc, big switch on and all i got was a little flash from some and nothing from others! made a test set up and tried with and without transformer, contacted manf they reckon they should work and that they maybe dodgy batch... all 12? any ideas guys? probably such a simple answer but today brain doesnt want to function! thanks!!