So you haven't even really had a first date with him yet and he's already texting non-stop?
Or was Friday night the date (after meeting/talking online)? In either case, yikes. That would send my "Need Space" hackles up for sure.
Does he work? I don't see how he'd have the time to text all day either!
That being said, yes, I would totally bring up the issue when you meet him for lunch. I think most sane, reasonable people will understand that people who work during the normal 9-5ish timezone don't have time to text all day long.
I think how he reacts will be very telling!