Incubator Flex watt question.

I picked up a Beverage fridge(cheeeeeap) that Im turning into a incubator and I was going to use 4 1/2 feet of 11" flex watt but, I just found out that they make a 17" flexwatt. Which would be better to use. Im going to be running the fan in the pic and water bottles. But which flex watt size would be better 11" or 17"? There both 20w also.
Heres a pic of my soon to be incubator.
http://i27.photobucket.com/albums/c1...n/IMG_8114.jpg

i would run the 17 if it is the same wattage, it would take up more room and give you a better steady temp it seems. just MO

also Congrats on cooler i have been looking for one broken around me but no luck yet :).

Thanks for you reply. Yea I was thinking the same thing but, I just read that 17" flex watt tape can only be cut every 2.5 inches or something like that...I guess Ill give it an try and let yall know. =]

I used the 3" because the 3" is like 8 watt and the 11 is only 20, The more wattage you can cram in there the faster it will heat up faster and be more reliable.... just dont exceed 500 watts unless you find a more powerful thermostat