If you not sure of the difference between these two types, here’s a quick expanation that will surprise you.
LED means Light Emitting Diode.
In a TV LED is used in an LCD-type flatscreen TV to create backlight for the screen.
There is another LCD TV called CCFL ( Cold Cathode Fluorescent Lamp) LCD TV..
The CCFL backlight technology was used in LCD TVs before it was replaced by LED.
The advantages of an LED TV over a conventional CCFL LCD TV are lesser power consumption, brighter and sharper displays and lesser heat dissipation.
HDTV, stands for High-Definition TV.
Any TV with resolution lower than the above is called SDTV or Standard Definition TV.
HDTV is mainly about resolution. So, an LED TV can be an HDTV, provided it supports the resolutions mentioned above.
But then the LED technology works only on HDTVs. So, there’s no question about LED TVs being better than HDTV.