converting to LED

Have and old light that has been leaking and throwing the GFI. Ive decided to change over to LED and have found a good sealed unit, but i need a transformer(Hardwired) to put in the Jbox.

this is what i need:
"The supply needed is either 12 volts AC or DC, the lights will work fine with either, although if more than 2 are installed it must be AC to allow them to synchronize correctly. These larger 546 LED lights draw about 2 amps max (not 30 amps) or around 25 watts per light. You can use a supply with a higher wattage rating as long as the voltage output is 12 volts. I have been advised that the Intermatic brand of transformers is one of many brands of power supplies supplied in the US which are suitable and may be one option."

id like to find the least expensive way to do this .
suggestions?

The Intermatic transformers would be the way to go. You would need to know the wattage of the lights and then purchase the transformer which can accomodate your total light wattage. Intermatic has a 100 Watt (PX100), 300 Watt (PX300) and a 600 Watt version (PX600).