Under Cabinet Mini Halogen Lights Safety Concerns

I installed 3 mini 20 watt low voltage halogen lights under my kitchen cabinet which are hooked up to a timer that comes on at dark and is on for 6 hours. My concern is that the lights get very hot, so much so that I can't hardly touch the inside of the cabinet above where the lights are. They are surface mounted to the underside of the cabinet, and I followed all the mounting directions. Should I be concerned about the safety of these lights? Maybe I should replace the bulbs with 10 watt ones, but I hate to do that because the 20 watt ones make the right amount of light.

 

First off check the manufacturers recommended wattage for the lamps, then a good check is to actually check the lamp. I had a series of mini lamp arrive the boxes said 10 watt but the lamps turned out to be 20w so don't count on the box for that reference. The other thing is these fixtures may be rated for 20 watt on non continuous loads and therefore may be rated for only 10 watts on continous loads, reread the instructions and see if this might be so. Another thing is the transormer properly ventalated, this can cause abnormal heat which is not really caused by the lamps only appears its from them.
I hope this is a little help.