Here are the 3 speedlights that I will be testing

From Left To Right: Yongnuo YN460, Yongnuo YN460-II, LumoPro LP120 Speedlights.
Here are the results of the above tested Speedlights

*This test also shows the 1/10 [ _ ] bar dashes of the bottom bar graph readings of the flash meter.

Guide Numbers As Stated By The Manufacturers
Yongnuo YN460 [...]