The song is each artist's first leader on the list.
MAX and featured artist gnash each earn their first No. 1 on Billboard's Adult Pop Songs radio airplay chart (dated March 31), as "Lights Down Low" lifts 2-1.
The ballad is MAX's first Adult Pop Songs entry and gnash's second; the latter's "I Hate U I Love You," featuring Olivia O'Brien, reached No. 14 in December 2016.
The Adult Pop Songs chart measures total weekly plays, as tabulated by Nielsen Music, among its reporting panel of 85 adult top 40 stations.