It is definitely terrifyingly creepy and keeps you scared till the climax. At first, I had a feeling that this wouldn't be that great and kept convincing myself to watch some other horror fictions. But when I watched the movie , Tbh,I had a great suspense about the climax and didn't expect the ending to take a different path than what I had thought. It was genuinely scary at times and allowed me to maintain an edgy feeling throughout. I personally think this movie is worth watching as it would make your blood run cold and keep you on tenterhooks. Also, the actors portrayed their characters nicely which adds on to the review. At last, I would say to not think further and go ahead, watch Lights Out.