You would get close setting up one cage, either/or, and then doing the same settings for the second cage but they're going to be different I almost guarantee. The floor in the top cage will get warmer with less power, because the heat from the RHP below it will rise into the cage above. My lower T8 is set to 87-88 and keeps 80 cool side, top T8 set to 85 and the hot spot will reach 91-93 but the cool side is 79. The top RHP works more to keep the ambient temp good while getting a hot spot from the lower cage's heat rising upward, and the lower one is working better for hot spot and ambient together but has a more narrow temp gradient. This is with the probes fed in through the channel for the RHP cord and set about 2.5-3" above the substrate. Tinkered with mine for a bit and still do occasionally when the seasons change.
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