Whatever you render in, I don’t think that you can do without HDRI maps in 2015. Even if you are 32-bit and strictly oldschool, you need reflection maps for your environment() calls, don’t you? =)
Remember that in 3Delight, you can light your scene with a giant non-convolved (=crisp) panorama, and it will be sampled all right, without any excessive noise. With the right shader, you’ll get lovely realistic shadows from it.
http://www.openfootage.net/?cat=15 – my favourite site with lovely panoramas; the licence is Creative Commons Attribution 4.0 International License.
http://www.hdrlabs.com/sibl/archive.html – a lot of beautiful stuff: not just panoramas, but also studio light type of HDR images (you can stick these into gel lights, for instance). The licence is Creative Commons Attribution-Noncommercial-Share Alike 3.0. I still don’t understand if noncommercial applies to rendered images or to the maps themselves, but in any case, it could be clarified with the site owners, if you do commercial work. I don’t.