I have a set of MR16 under-cupboard downlights which are powered off a transformer which has a flex and standard 3-pin plug. The plug socket i want to plug this into is behind a cupboard so is a pain to switch the lights on and off. I want to extend the flex between the transformer and the plug and inlude an in-line switch. I've seen some switches rated at 2A - is this OK or, alternatively, if this depends on number of lamps, transformer etc... how can i work out if a 2A rated switch is suitable?