AQUEON PLANTED AQUARIUM CLIP-ON LED
This fixture has a nice metal construction and is relatively cheap for a beginner getting into the hobby. The downside is that there are only 3 modes (blue + white) OR moonlight (blue only) OR off. Although advertised to fit aquariums up to 20 gallons, this fixture is only 8" in length. It is also worth noting that the distance from the edge of the mount to the center of the LEDs is 5 inches (see pictures). Make sure to measure your tank to see if this fixture works for you. The tested color value is around 6000-7000K compared to the 18400K value of the manufacturer.
PAR tested using Seneye PAR meter unless otherwise noted in the notes section. Testing process is documented here