i have experimented with 60,75, and 100watt bulbs... 100w gives me 80 degrees in the basking zone.. read from digital thermometer i got from home depot. and i have a humidity gauge as well. cage is 24x24x48 so thats why 100w
as for highways, the pothos vines are not enough? they are ziptied all over the screen so they are sturdy... he does a pretty good job of getting around. i know the more the better!