26-28C...
When I raise the light, the temp is the same, and plants look even worse...
When I move it away, so there is about 2 times LESS light... they make dew, but lose color (binatas turn green, adelae goes white, nidiformis turns white and so on...) only thing that seems to like the situation is P. esseriana, who shows sighns of life, and dried sphagnum that now has some green growth on its tips, and S. Leucophylla... at least they are doing ok...
I'm exprementing with different bulbs right now... maybe I'll be able to find a solution.
I also noticed that if humidity goes below 70, plants look like they've been in a desert for last 150 years. I notice they made a LOT more dew at night, in total darkness, than during the day with light... Also after feeding... they dont make ANY dew at all for days... must be saving the energy for growing, because thats what they do nicely at that time. I still agree with you that it could be temperature... they used to look a lot better at 20-22...
BLEH... I'll just keep trying and maybe I'll work something out... my latest experiment yelded some minor improvement... lets hope it'll work...