I see you;re confused too, where have I mentioned the LED the LED doesnlt t ell me much especailly when I'm in the front room or anywhwere else.
My LCD energy meter which updates around 3 tiumes a second tells me how muc h power is coming through the live wire from the outside world, I can set t his meter to read the number of watts, or the curretn cost of that power. It ahs a setting for me to imput day and night rates and will display accor dingly, it also has the option where I can (using a USB cable) send the inf o of how much I use in increments of 30 mins for something like 3-4 months , where I can export this to a speadsheet or use their own tools to draw me a graph.
Again I DO NOT NEED to send this info the my leccy supplier every 30 mins.