Chip
ΜΟΛΩΝ ΛΑΒ&
A few reasons. First, unregulated flexwatt is a much higher risk to fail. It isn't designed for the reptile industry, and gets hotter than ideal in most herp applications. Another reason is, the hot temps will make the plastic tubs brittle sooner, so the life of the tubs are compromised. Finally, in most applications, the tubs simply aren't ventilated enough to allow enough heat to leave, so the entire enclosure would overheat. But in something like a Freedom Breeder, they let enough heat out to have a safe gradient.