Those bulbs won't be too dim, but it's really hard to say since they don't provide a K
temp or a CRI chart for them.
I had a bulb for a while that was an 18,000K color temp. The higher you go over 10,000 the bluer the light gets. This isn't to say 18,000K is anything like actinic...just that if you held it side by side to a 10,000, it'd have a noticably blue tint to it.
That will really bring out the red, blue and purples in your fish. yellow will be largely unaffected, as are greens.
You might hit your LFS
and see if they have these in stock, as i'm sure the package itself has at least a K
value, if not a spectral graph.