I have made many electric signs up until 2001, and none since. I have serviced a big neon pylon and wall sign, but really no knowledge of what is current with the technology.
So I discovered there are new fluorescent tubes that work with electronic ballasts.
The difference in power consumption between LED and fluorescent and the old magnetic fluorescent magnetic ballasts is about 60% savings.
There is really no difference in power consumption between the new fluorescent and LED lighting, except the LED lighting is 1/3 less bright.
What nobody could answer for me was how much actual money it will cost and how much it will save over a given period, say 5 years.