LED MR16 Lamps replace halogens in indoor applications.

Promoting energy conservation by replacing 35–50 W halogen MR16 and PAR16 lamps, LED PARfection™ MR16 lamps include

[source: http://news.thomasnet.com/fullstory/LED-MR16-Lamps-replace-halogens-in-indoor-applications-20024194]