It's my understanding that they do not need any artificial lighting. Mine certainly have been thriving without, for many years. I am in Melbourne, and I do not supply heat, either, except for hatchlings in their first year. Being nocturnal, UV is not generally necessary.
You may wish to supply a nesting box. (Even if you choose not to breed thicktailed geckos.) One of my thickies - in particular - likes to hang out in this box for a few days prior to sloughing/shedding his skin. Having said that, his mate sloughs perfectly, without ever having used the nesting box for this purpose.
For a nesting box, use one of the deeper rectangle take away containers (or similar.) Cut a large entrance hole in one end (near ground level) and put a few small air holes in the lid. Put some electrical tape around the entrance hole, so the cut plastic is not sharp. In this container, put a layer of damp coco peat. (say 2 inches deep.) Take the lid off the container now and then, and mist the substrate with a spray of water.
If you've not used coco peat before, it comes from Bunnings, in the form of a compressed brick, for around $3. (Get the variety that DOES NOT contain any fertilizers or other added chemicals.) Put the brick in a bucket, add a fair bit of water, and presto - watch it morph from a brick to a bucket-load of moist substrate. (Takes around 20 mins.) Squeeze out any excess water, prior to using the peat. You will most likely have a large amount left over, but you can use it in the garden - around the base of plants - to trap and maintain moisture.
I'll try uploading a photo of a nesting box, in a little while.
Enjoy your gecko/s! They are amazing little creatures.
Susie.
Here are some nest box photos. I took the lid off, so you could see in, better...