Thanks for the replies everyone!
The lamps have clamps (that rhymes!

) but there's nothing to set them on. And it is a ten gallon long. The wattage is pretty low (idk what it is) but it just looks hot in there.... It's not blazing hot but it looks I would be sweating in there idk. So I think I'm just going to take the fixture back and get one with a dimmer.
Or I could give it to my little brothers mountain horned dragon? Idk haha