Radiant heat panels use the same or more power than flexwatt does.

Radiant heat panels are better overall, they heat everything below them whereas flexwatt only heats up the floor of the cage. This limits the substrates that you can use.

To regulate them all I would suggest that you get Herpstat 4's. The Herpstat 4 has 4 independent thermostats in a single package. It is exactly like having 4 individual Herpstat 1's in a single box. They are more cost effective as well. Some people will use a single Herpstat to regulate an entire stack of cages. While it can be done I don't recomend it.