I don’t think it’s the hard and fast rule the Internet seems to repeat where yellow=diurnal(day), orange=crepuscular(dawn/dusk), and dark=nocturnal. The owls do what they want, and if you search which owls are nocturnal vs crepuscular or whatever, you’ll see people give different answers.

Great Horned Owls have yellow eyes, but you’ll see people debate if they’re nocturnal or crepuscular. Barred Owls have dark eyes, and again you’ll find people debating if they’re nocturnal or crepuscular.

There are plenty that do fit the formula though. But it’s not a rule. Just like lots of owls have asymmetrical ears to enhance their triangulation, but not all do. They’re all a unique combo and they’ll ultimately hunt when they have the best success in their particular environment.