I wouldn't ever use heat lamps with a T8, Flexwatt and/or a Radiant Heat Panel is the way to go.
You can run multiple cages off of a single thermostat but there is risk to it (only 1 heat source is being measured by the thermostat. This completely circumvents every safety feature on modern thermostats) I can say from experience that all of my T8 stacked are set to different temperatures to achieve the same 90 degree internal hot side temperature.
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