Quick research:
MAX 16 levels on most type 2's.
Type II Phaser - Star Trek : Freedom's Wiki and
A type-2 phaser or phaser pistol was a typical handheld directed-energy phaser sidearm used by Starfleet and United Federation of Planets personnel during the 23rd, 24th, and 29th centuries. In Starfleet, it was standard issue for landing parties (away teams) and officers aboard the ship. More...
memory-alpha.fandom.com
Memory Alpha actually has a series of images showing the type 2 and it's 16 settings. I think the images were left-right reversed, as they who show level 1 as the bottom-right light. Lights stay green until level 8. At level 9 a red light turns on and the green one beneath it turns yellow. At level 16 the entire upper row is red and the lower row is all yellow (no green lights. Maybe they used 3-color leds in the bottom row, and reds in the upper row? Unless they CGI'ed in the power window in some seasons.
Notable exception -- the "dustbuster" type in one image shows a single row of 10 lights. (Caption says its circa 2364, and from the paleness of the hand, I think it was Data holding it.)
I mean I can understand changes from one Trek to the next, or even one season to the next, but you'd think they would have some consistency.