Well, nothing is going to actually make things brighter, although yellow does tend to make it look so, and is really good on slightly duller days. Whatever you use will always be reducing to some extent the amount of light that is transmitted to the eyes, although what the value of this is for these particular visors I couldn't say, but they won't be quite as effective as a neutral tint visor at a similar sort of apparent density as they will be removing a narrower band of light wavelengths. Different people tolerate differing amounts of bright sun, so it would be quite subjective as to whether the density was sufficient for an individual.
One option would be to use the yellow visor, but to add a strip of the sort of filter material used on car windscreens (or even the mirror film) along the top edge, much like a tinted car windscreen. It is fairly easy to position it so that in normal use it doesn't come into your line of sight, but a small tilt of your head forward will make it do so.
Phil