I just got a Convoy H1 519a 4500k for about $20 as a first decent headlamp, it's really great for the price with a few weaknesses.
The H1 is easy on the eyes and the TIR is nice and covers a wide view. Compared to my S2+ which uses 519a at 4000k the difference is noticeable (see photos in link).
The UI is cool as it's the first ramping light I used, but it ramps a bit too fast. Compared to the S2+, the H1 has some advantages like shortcuts for strobe/turbo/moonlight/batt check, while on the S2+ I just disabled those since I didn't want them in the main rotation. The button also takes some getting used to since you hold down the button (not half-press) for secondary functions.
The body feels really nice and sturdy and not as heavy as expected when wearing it with a head strap. More compact than the S2+. I got a magnet from Convoy and glued it to the tail which was super easy to do, just a bit messy. After removing the excess glue with alcohol, it looks great. The head strap is pretty hard to put on since you have to force it into the rubber loops, but once it's on it's very secure.
Well I did notice it's been hotter lately