My 32" LED Screen that I run 24/7/365 and my 55" LCD I run when there is nothing on TV.
What system is connected to your LED Screen that is running MA3?
EDIT: I see in a previous post that you are using a Laptop. If you are interested in a low-power device that won't be too hot, see my suggestion below:
Since there is an android version of MA3, you could use a
CuBox-i device to run Android and hook it up via HDMI to a display. Running MA3 on a CuBox-i4pro would be around 7.5W.
I like the idea of a dedicated monitor!