Hello,
So, these guys come from very hot and humid digs throughout Southeast Asia all the way to India.
I run my Tokay rooms from 80-85 degrees at night up to the very high 90's during the summer months. Right now 90 to 92 might be the high and 78 might be the low especially on cold rainy nights during the winter. I'll mist heavier on rainy days/nights as well to match the outside conditions. Cooler rainy months bring on the breeding season and the boys will start squawkin'.
By mid-February I'll start bringing up the temps slowly and by late April I'll start reducing the amount of misting.
I know others have a different opinion on this next part, but I like under tank heat for individual enclosures. What I like is that it will dry out the substrate in between mistings while keeping the humidity up. Now this assumes heavy misting several times a day, especially during the winter into the spring months.
50 watts from above is fine but it may not be enough depending on how tall the enclosure is. If the substrate stays moist it will invite mold, riot and pests. There needs to be enough heat and ventilation to keep your Tokay happy, enjoy.
Michael