My friend once tried to lend me a book set in a fantasy world. I think he said something along the lines of "It's got wizards! Solid light constructs! It's a must-read in your life!". Being young and hated reading, I only read a few chapters, but eventually forgot about it and returned the book. From what I have read/ could remember, the book contains magical people that could create solid light substances, and use them in everyday tasks or combat. It left me an impression of being like the Green Lantern, who also could create solid light constructs in different colours.
The book was in English. My impression of it is that it was very long, as that was one of the reasons that I gave up reading it. This happened ~8 years earlier and the book looked new, but I don't know whether it is newly published or my friend only just bought it. He also said this would be a series. I don't remember much more though.