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Stellarium is using the magnitude estimates from MPC, not the most recent values you would get from JPL. I have it showing as mag ~4.8. In your ssystem.ini file (should be in your %appdata%\Stellarium\data directory), find the section for the comet and change the two relevant lines:
absolute_magnitude = 5.1
slope_parameter = 17
Mine reads:
[c2012f6(lemmon)]
parent = Sun
orbit_Inclination = 82.6078
coord_func = comet_orbit
orbit_Eccentricity = 0.998531
orbit_ArgOfPericenter = 304.9874
absolute_magnitude = 5.1
name = C/2012 F6 (Lemmon)
slope_parameter = 17
lighting = false
tex_map = nomap.png
color = 1.0, 1.0, 1.0
orbit_AscendingNode = 332.7147
albedo = 1
radius = 5
orbit_PericenterDistance = 0.731246
type = comet
orbit_TimeAtPericenter = 2456376.0137963
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