Right, just linked you too them.
Those are not made by Arcadia, they are a Chinese fixtures that Arcadia, is slapping their name on. It's common, lots of people do that. The one I linked is the same.
Arcadias comes with their bulb, for UVB, but the price is much higher because of that, so you might save a dollar or 2 buying the Arcadia version, but if they are sold out or whatever, the one I linked is the same.
Sunblaster (their reflector isn't 180), Hydrofarms Jumpstart, Biodudes T5, Vivarium Electronics T5, Arcadia ProT5.
All same Chinese fixtures

.