New lighting?

fistly the reson the new lights in the kitchen don't need a transformer is they are most likely MAINS and not low (12v) voltage. You can easily tell by the fitting on the bulbs thin straight wire for low voltage and like a flat top mushroom shaped for mains and is should say this on the box they came in.
As for the dining room light might be shear coinsidents the dimmer. Turn off elecs disconnect the kitchen lights making end of the live side safe then turn lights back on see if the dining room light still pulsate. If the light did not pulsate before then it can't be if you have energy saving bulb in it. If unsure advise get in electrician.

bob
November 2012

could be two things,its either the dimmer ,or you have fitted energy saving bulbs ,these cant be used with a dimmer,are your dine room lights two way ??if not turn power off at consumer unit,short the wires on ur dimmer turn power back on,if they light up ok then the prob is in ur dimmer switch

mm
November 2012