more like a normal sword in this respect.
Honestly that's not much of a weight difference or would actually be lighter than some sabers
however on the subject of dark saber blades. I think one guy had tried putting black paint down the inside of the blade, then when it was partly dry shoved some wire down there to scrape lines in it. not sure how well it worked.
I was thinking of trying getting a HEMA plastic sword blade (in black) and doing lightning down the edges with some sort of highly reflective paint then mounting the whole thing in a hilt with a white LED. In theory this would give a similar look to the dark saber whilst eliminating a lot of the strength issues.
Plan B is to do the same but just a regular white paint down the edges.