Moving to a grow tent

[Orchidtinkerer]

WW what dusty says is all very valid for a grow tent. It prevents the orchids humidty escaping thus creatng a more stable environment but at times the humidity can shoot up to dangerous levels which is frustrating and might seem like its not worth it which might be true, grow tents certanly need more maintenance than freestanding orchids!
But there are advantages, humidity is the least important advantage and might be the first logical thing people think of but they are actually designed for the outdoors where their main function is to trap the heat of the sun.
Same indoors. They can be great at raising temps by 5 or more degrees on top of what the sun would normally heat the plants by. But they can overheat easily too so need to be monitored more.

I think the humdity tray might be overkill, in some places I need them, others I don't. 90% is too high (just leave it dry). Also watering will affect humidity considerably - it will go up after watering and go down as pots dry out. If humidity is an issue place the fan sucking air in from the bottom, ie place the fan facing upwards on to the lowest shelf so it sucks air in.

Water trays absorb a lot of heat, once they are warmed up they release the heat, so after 2 hours your reading will have seemed low and although heat mats don't raise temps by a lot it will raise it more after more time.