I replaced a 4 year old Dell 30" display with an Apple 27" Thunderbolt display and I'm amazed at how cool this thing is, both figuratively and literally. My old Dell display generated a lot of heat. If you held your hand over the top edge it felt almost like the heating system vent. The TBD's aluminum back has no vents that I can find and is cool to the touch. Is there that much difference between LED and LCD technology, or am I missing something here?