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@KDense
Broadly speaking, new combinations of known technologies are not patentable (i.e. torch on a slipper = new (at least I've not seen one), but obvious - each functions as you would expect). This is the case here - seat post plus EL film = EL seatpost. Seat post still functions as seatpost, EL film lights it up. No surprises there.
However, there could well be something inventive in how you manage to get the inverter inside the seatpost - this is solving a very specific technical problem. Likewise, other details around the main concept could be entitled to patent protection.
BUT, if you publish your idea (such as on this forum) before applying for a patent then it would be invalid. So, if you were to consider protecting this or any future ideas, my advice would be to keep the details secret until you had an application on file.