Welcome to the DeepSeg3D wiki!
If you just want to directly test DeepSeg3D with a working light setup and skip the data conversion and preprocessing, you can download the Bullitt_Isotrope_light dataset. It use a voxel spacing (1.5 x 1.5 x 1.5) and the image size is 153 x 153 x 68.
You can also use the Bullitt_Isotrope_light_mult32. It use a voxel spacing (1.026, 1.026, 1.066) and the image size is 224 x 224 x 96. The image isn't really isotrope but each dimension is a multiple of 32.