Actually, amazon tree boa temperatures aren't really different than corn snakes - 75°F - 85°F.
I mentioned about the high temps of the heat mat, because it was said that you needed to have a thermometer with the bulb, but nobody mentioned that the same was needed for a heat mat, and it could be misinterpreted to mean that a heat mat was the right temperature from the beginning - gotta be careful!
And about the energy - I don't think it's that much of a difference.
Here's the results of my calculations:
25-watt bulb: $10 lamp, 4x$1 bulb=$14 initial cost.
8-watt UTH (that's what my 20 gal Zoo-Meds are): $20 heater, $25 thermostat=$45 initial cost.
A 25-watt bulb costs $0.7074 a month to operate.
A 8-watt heat pad costs $0.2263 a month to operate.
The bulb costs $5.77 more to run a year, but the initial cost was $31 dollars less.
1st year cost:
Bulb: ~$22.50
UTH: ~$47.70
Second and on yearly cost:
Bulb: $12.50 (total $35, $47.5, $60)
UTH: $2.70 (total $50.40, $53.1, $55.8)
Right. I'm sure the figures are a little off (won't the thermostat lower the energy usage of the heat pad? and I'm not sure of how many bulbs are needed a year), but it seems to take 4 years before the light bulb becomes more expensive than a heat pad. It would take even longer if the light wasn't on all the time. BTW, the prices were computed using 3.93 cents a kWh. I'm not sure that's very accurate, but the basic idea is the same.
Did some more calculating: even if 9 bulbs a year are used, it's still cheaper the first 2 years.
If the bulb is only on half the time, using 4 bulbs a year, the price is cheaper until the seventh year .