A higher rear sight number (taller) will raise the point of impact, but a smaller front sight number (taller) will lower the point of impact.
The height number, represented as a single digit (except for "10," which would thus be two digits) is stamped on the left side of the front sight body, for both standard sights and SIGLITE night sights. The height number is stamped on the left side of the rear sight body for SIGLITE night sights, but on the left-front face of the rear sight (when viewed from the rear) for standard sights. My Sig Pro SP 2340 chambered in .357 Sig came with #8 front and rear SIGLITE night sights from the factory. Here is a photo of the left side of its front and rear rear sights, showing the "8" that is stamped on each:
Interestingly, the SIGARMS price list includes only #6 through #10 for the rear sight, for both the standard sights and SIGLITE night sights.
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