If the power rating of the 12V floodlight is 10W I think you would need to have a custom made adapter with its own power supply, Maybe consider using 120/240 v Led Floodlight using an optocoupler interface driving a thyristor. Here is an example of a circuit that may do what you want:
http://www.instructables.com/id/Small-Triac-Switch/
For more details, please check the link:
http://www.spooky2.com/forums/viewtopic.php?f=39&t=5054
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