What are your units for measuring? That sounds extremely large even for centimetres. If your enclosure is truly really large you might be best off with 2 of those heat lamps on either side of the middle section of the enclosure.
Your heat mat sounds fine, just make sure to use a temperature controller with it.
For my enclosure I use a heat mat for my hot spot, and then use a 60 watt heat bulb to maintain ambient temps at 27 degrees Celsius(80 Fahrenheit) during the fall and winter season. During the summer my ambient temps are naturally around 26-28 degrees.
So depending on how large your enclosure actually is, it’ll change what type of watt you use and how many bulbs you’ll have to use. I use a 60 watt to maintain ambient temps and I have a ~35 gallon enclosure.
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