I know of at least one new aircraft in development where the requirement is for an LED landing light system including NVG capability and the lighting manufacturers were responding in a positive way so the technology is there.
If you wish to know more about what is available for aviation use, two vendors to contact are Hella and Emteq. I have found both to be very helpful
http://www.goodrich-lighting.com/
http://www.emteq.com/
rtb