mukerji
To add a little to Stumpy01’s comments trout has done the conversion for people in the past and may be able to do it for you now depending on his workload for his own lights.
Last year Trout produced a heat sink LED package with Cree XPE LED, see the tread about Lumicycle Halogen to LED kit vote above. I have used this package in combination with a Black Cat Tech 830mA driver board to really good effect. Never had the lights tested but they seem brighter than before with the halogen bulbs and battery lasts way longer.
As Stumpy said the three main things you will need to get hold of are
1 LED & heat sink package (available through trout http://www.troutie.com/)
2 Buck driver board (available soon hopefully through BlackCatTech eBay shop)
3 New switch depending on the driver board you go for (available soon hopefully through BlackCatTech eBay shop)
Trout is a really decent guy, drop him an email trough his website about the possibility of the conversion and I’m sure he will get back to you with a quote.