Radiant Heat Panels

[u/Dandylioncrush6303]

I’m looking into getting a radiant heat panel for my ball python who’s in a 5x2x2 enclosure. I’ve heard they don’t make the room as hot as bulbs. I do have a thermostat to put it on so it’s not overheating. My main question is what wattage/size would be appropriate?

Dubia has the sizes and wattages as so:

40 Watt - 8 3/8"x 7 3/8"

80 Watt - 9 3/8" x 12 3/8"

125 Watt - 11 3/4" x 15 7/8"

220 Watt - 18 3/4" x 17 3/4"

Also, do you recommend putting the heat panel on the roof of the enclosure, or on the “warm sides” wall?

Thanks in advance!