This is correct. The maximum light from all-upgraded blue armor is 60 which equals Level 24.5ish.Pretty sure you're stuck at 24 until you get legendaries/exotics. I was. Couldn't find anything that would raise my light level higher. Once you can buy one legendary piece of armor you'll be at 25, and when you have a full set, probably 26.
I think... when I hit 26 I'll put together a bit of a leveling guide. Seeing people farming one spot for hours and then raging when they don't get upgrades out of it is... troubling.