I just checked the place where I bought my flexwatt and the watts are 6watts for a 4" tape. When I had it plugged in direct I set an oven thermometer on it and the heat was over 100'.
I have it on a rheostate ( home made..using a dimmer switch, plastic box, a double outlet plug, and heavy wire) and the temp is now about 96' The inside of their plastic boxes has just a gentle sensation of heat..Just like my holding them in my hands,
98.6'
It is very easy to overheat a baby or any snake, but a baby espaecially.
Just my info. 
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All creatures great and small we are to care for them all.
4 Corns,6 Kings,3 Milks,1 German Shephard,1 Cairn & 1 Giant Schnauzer