Can't see it in a tub.
I made a cover that goes between all 6 of the mesh lid clips I use on my tank and covers 95% of the screened area. I vent the tank on the cool side over his perch on the right side of the tank over his cold side hide. Helps hold the humidity in on the hot side too and you use way less juice on the bulb.
I would assume you could also ghetto it and just wrap cardboard in foil wrap.
As soon as I made the cover I was able to drop wattage on my bulbs and just soaking cypress mulch and keeping the water dish close to the hot spot is enough to maintain 60 humidity at 90 degrees. For sheds I will soak some moss and then put it in his hides and everywhere but his basking rock.
I get why breeders use racks and tubs, but if you have 2-3 reptiles I'd prefer to display them.
My Ball Python knows us, he comes to the glass to check us out if he's out cruisin and not in hunt mode. I'd hate to miss that. Plus being on my gf's dresser, it's nice to take a peek when you're tossing and turning at night.