For that length of span, a 1" x anything ridge beam looks undersized even for the layman. My short garage has a 1x6 and it is sagging.
There are look-up charts on the internet for span calculations, and the local inspector(anonymously) may have some info on this.
This is one idea. It has an accessable crawl-way for servicing, with ample lighting.
The collar ties are lowered and reinforcement was added:
