Further to bhg and Builder, although low voltage LEDs will work for a time on AC, they are likely to need DC to properly survive. This means fitting the appropriate transformer. Mains voltage LEDs, as said, will generally outlast filament bulbs and do about as well as fluorescent ones or perhaps even better. That said, the sweeping claims made at the outset when introducing these to the market have not been met. We have LEDs throughout, some mains and some low voltage - overall we are very satisfied, even with nearly all of the cheapest ones from China via eBay (some/many of which I suspect of being batch rejects or else not quality tested).