The fiber optic are very easy to see in daylight, and the Tritium makes the sights bright at night, but not too bright.
Early evening might be when the sights are less than bright, as there’s not much light left for the fiber optic, and it’s not quite dark enough yet for the Tritium.

But the best of both worlds. I am getting another Shield today , a .45, and it will also get the Tru-Glo TFO’s pit on it.
$76 shipped is great for straight Tritium sights, most of them go for $100 a set or more.
The fact that these are also Fiber Optic sweetens the deal.

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U. S. Army Veteran