Hi, you mentioned that the basking temp is in the low 90's. Can you fill us in on the type of thermometer you're using, is it a digital strip, round gauge (dial), infrared temperature gun or digital with a long wire & probe end? Where exactly are you testing the temps? What size tank are you using the 50 watt bulb in? Once we find out these answers, we can help you get the temps straightened out.
Also, you said you are using a 5.0
UVB light, would you be able to give us the brand name and let us know what the distance is of the
UVB light?
As far as using the red bulb at night, if the room temp doesn't drop below 60 to 65, you don't need any nighttime heating. But, if it does, then we recommend a ceramic heat emitter that gives off heat but no light. The black and red bulbs can actually disturb their sleep.