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but what is the most power efficient system,
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The most power efficient system is any one that has a temperature feedback loop. These units only provide enough heat to keep the optics a set delta above ambient, hence always run at the lowest level required to maintain said delta
I run a home made one, but irrespective of model, i found it was beneficial to have a wide insulating strip outside of the heater. The sensor sits under the insulation, but away from the heater strip, hence getting a true feedback, with lots of built in damping.
Andrew