Pentair Microbrite maximum voltage for "long runs" ? Manual says 13 or 14vac

Trying to figure out what the upper end limit is on microbrites which are advertised as 12 vac lights.

The manual says :
When using longer runs of cables or multiple lights per transformer, it is recommended to use the 13 VAC or 14 VAC tap on the transformer.

I tested my new transformer output and it's showing 14.4 VAC. My larger original pentair transformer outputs 12.5 vac and 13.5 vac. The microbrite manual calls out being able to use 14vac on long runs due to wire resistance and voltage drop; but I'd like to know if 14vac at the actual light is acceptable since I don't want to cut the wire and measure the voltage at the light itself.

Anyone reading this that has used Microbrites at 14vac or can provide input?