I never use a basking spot, just a 5% either exo terra, zoomed or arcadia compact uv. This time of year my max daytime temps are around the lower 20'sC
In the summer months they get up into high 20's without any heating.
Night time temps this time of year drop to around 14/15C.
I provide no light at all, at night... Pygmy's don't like it or need it.