The boxing drama, which I often found impressive in its first season, is not getting a second. As a note from FX said:
FX will not be moving forward with a second season of the critically acclaimed drama series Lights Out. FX will air the final two episodes of the current season in its regularly scheduled time period, Tuesdays at 10 PM E/P (March 29 and April 5).
The season finale can, in a way, serve as a series finale -- although it certainly left open some tantalizing possibilities for a second go-round. Still, enjoy it while you can; the finale is quite good.