So far the heating/lighting is quite good. I have a temperature range from ca 29° C / 84° F on the branch right below the 150 W Metal halide light, 25° C / 77° F at their cork tube at the other side of the enclosure down to ca 23° C / 73° F at ground level. During summer time I might have to switch off the Metal halide light to prevent overheating, but other than that it should be fine. If I really need more heat I can still add another 70 W Metal halide light to add another hotspot and provide more warmth.
The LED light and the Arcadia ProT5 6% Forest are there to provide the ambient light and (in case of the Arcadia) additional UVB, but the main (only) source of heat and the primary source of UVB is the Bright Sun Metal halide light. I use this kind of arrangement in each of my enclosures to provide a hotspot which is also the brightest spot in the enclosure, so the snakes can associate light and heat. I don’t use any other kind of heating in any of my enclosures.
So for your 6 x 2 x 3 enclosure a 70 W Metal halide light should provide enough heat for your boa and if you place it to one side you create a nice hot basking spot on one side and a thermogradient to the other, cool side.
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