Our standard sizes of 50cm, 75cm, 100cm, 150cm, 200cm & 250cm are the approximate size of the LED part of the sign. The acrylic backing is roughly 5-10cm bigger overall.
The standard sizes relate to the longest length of the sign whether that be the height or width.
Some signs over 150cm will need to be split in 2 to keep the carriage costs low. This is mostly for worldwide orders, and not so much an issue in the UK.
We can supply signs in all sizes, so if our standard options aren't what you want, get in touch with us at email@example.com
and we can make it to your requirements.