Had a project where we installed a bunch of track with low voltage track heads that take a 12volt, MR16 lamp - 75w max. We installed 7w, LED MR16 lamps, and in the first 1-2 months have already had several go bad. The counter salesman at our local wholesale house said that the 7w lamp wasn't enough load on the track head xfrmr - that there's a minimum load you need on them otherwise you get what's happening to us - the lamps fail prematurely. Got on the track head manufacturer's website along with the LED lamp manufacturer's website and can't find any data to support this. Have you ever heard of this? Any help would be appreciated.