Does having lead-in lights in sight allow descent below MDA? Does having lead-in lights in-site during an approach that includes them allow for a pilot to descend to 100 feet above the touchdown zone elevation? 14 CFR 91.175 allows a pilot to make such a descent if the approach light system is in-site, but does a lead-in light system qualify?

The approach also states the following:


  When visual reference established, fly visual to airport via lead-in lights to Rwy 13L or 13R.




Also worth referencing here is this question about what counts as runway in sight, but this question is specific to lead-in lights and is not answered directly by that question.
No, you may not descend below MDA having only the lead-in lights in sight.
Reference FAA Order 6850.2b, &quot;Visual Guidance Lighting Systems&quot;, page 1-3 through 1-5.
According to this order, the list of approach lighting systems is as follows:

Medium Intensity Approach Lighting System (MALS).

Medium Intensity Approach Lighting System with Sequenced Flashers (MALSF).

Medium Intensity Approach Lighting System with Runway Alignment Indicator Lights (MALSR).

Simplified Short Approach Lighting System with Runway Alignment Indicator
Lights (SSALR).

High Intensity ALS with Sequenced Flashers (ALSF-2).

Omnidirectional Approach Lighting System (ODALS).


The Lead-In Light System is not in this list.  Instead, it is found further down the page.  Here's the key sentence:

The LDIN may be terminated at any approved approach lighting system, or it may be terminated at a distance from the threshold compatible with authorized visibility minimums permitting visual reference to the runway environment.

The LDIN is not an approach lighting system and so you may not use it to descend below MDA.