I think the low watt spot would be safe both for the plants and the general cage. It's not going to cause much of a temp rise. A spot will have a more focused beam than a general house incandescent bulb. You could prune leaf bearing twigs back right around the beam to avoid burning them. At that wattage I don't know if it will make much difference which you use. As for the high humidity, it will probably be very difficult to keep the cage at 100 or even 80% all the time. The same used to be said of deremensis so I really struggled to create that, but since then we have found this not to be totally true. At 100% humidity you have fog, almost no air. What may be more important is to have microclimates in the cage they can retreat to and frequent cycles of really high humidity followed by a short drier period such as what might occur around noon in their wild habitat. This should help keep the air exchange going.

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